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Q2: Dullstroom is a good place for lunch, but it's about 2 hours from the AirPort. There Are several "gas stations" along the way with Spurs restaurants and sandwiches etc, the parking lot has guards.

Q6: I can't comment on Satara, but last year I stayed at Royal Legend Safari Lodge in Timbavati, and when you go out on game drives you go to many of the same places as Gomo Gomo does, and I must say that you're in for a treat. We spent four nights there, and every day we saw something new and exciting like bushbaby and civet.

I see that you have written down how long it will take to drive from A to B, I hope you have some leeway because very often there's roadwork or some other delay.

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Day 4: you don't need to drive to the river - the river runs right by the camp and provides nice game viewing from within the camp. You can head out any number of roads from the camp itself but yes the road along the river is scenic. If you are not staying at Satara on Day 5 (?) you won't be able to do the sunset drive as you can't get back to Letaba in time for the camp gate closing. You can book the sanparks drive in advance (which I have done before) but we have also not had a problem getting places on drives 'on the day'.
GPS complete waste of time in KNP - not needed at all. You cannot get lost in Kruger. You need to book the right rental car 'group' ie a SUV if you want higher seating. Very hard to book a specific vehicle but you can always make a request and see what the response is. If you can I would book an extra night at Gomo Gomo (its a great camp) and still keep the Satara stop over.
Tip: Take a very good torch/spotlight (minus the heavy batteries which you buy when you get there at camp shop) and do your own night walk around the camps. We saw amazing wildlife in the camps and just outside the fences - civet, hyena, buffalo, porcupine, waterbuck, bushbabies, hippo, owls, genets at Letaba and Satara.

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Now that is what I call detailed planning.
I have not been to Gomo-Gomo lodge, but have been to other lodges in the Klaserie.Umbabat area and thoroughly enjoyed the visits. I would have preferred to visit Kruger park first and then go on to Klaserie, lest you find Kruger an anti-climax after the (possible) close encounters with the big 5 in Klaserie.
Day 4: Letaba is about 50km from Phalaborwa gate. Allow at least 2 hours to get to the camp. The camp gates close at the same time as do the park's entry gates. I would most definitely take a drive along the Letaba river just north of the camp. Both in the late afternoon and again next morning - there always seems to be a great selection of animals and birds along that stretch of road. If you are lucky with the animal spotting it could take a couple of hours although the stretch f road is only about 10km long.
I would suggest that you do the sunset drive on day 6 as you are not moving on to the next camp on that day and don't have to rush to get to camp in time for that drive. It should not be necessary to book the activities before getting to Satara, but I would feel more comfortable doing so.
Day 7: The S100 is a must do. But do start early. Very early. Cook yourselves a good breakfast at Nwanetsi. Note that there are no toilet facilities at Sweni hide. Use Nwanetsi. We have seldom seen much game along the Trichardt road and you might consider taking the H6 tar road back towards Satara and then using the main H1 south to Tshokwane (also a tar road - whereas the Trichardt road is gravel). Have lunch (not breakfast) at Tshokwane either before or after doing the Orpen loop and spending an hour or so at the dam. The Mlondozi dam is also a good spot to stop and have a break. Do not under-estimate the amount of time you will spend at Sunset Dam - especially if you are a birder. 1/2 hour may not be anywhere near enough, but early next morning a return visit might be called for. The bridge over the Sabie river just before you reach Lower Sabie (along the H10) is another excellent game and bird viewing spot, so allow more time for that too.
Day 8: Get another early start - that road to Crocodile bridge usually has a lovely variety of animals. We have in the past seen all of the Big 5 along that short stretch of road. Unfortunately you will be there during February (+/- 3rd) when the camp gates open at 05:30 whereas in January they open at 04:30.

Your questions:
2) I agree with Cath81.
3) I would want to do the Long Tom Pass in the afternoon with the sun behind me. Not next morning driving into the sun and not getting the best of the views. Therefore I would prefer to get at least as far as Sabie before stopping for the night.
5) I agree with 3dogs - a GPS would be a complete waste.
6) Leave your plans as they are.

Enjoy.

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Just another thing - bring 2 decent pairs of binoculars along. One for each of you to obviate any marital discord.