For info, when I was in Burma about 4 years ago I was constantly aware of what I called the walky talky (personal radio) guys. I assumed they were the not so secret police. They were in the airport when I was reassembling my bike, I saw them by the road in small towns and when I asked a local about accommodation he wouldn't answer but pointed at one of these guys.
My point is, IF you need a permit and IF these guys know you do, I doubt you will be able to avoid them. The fact the Indians let you through doesn't mean that you won't be checked out once you cross.
I take your point about seeing if you still need one Bill, but if you do then I reckon it would be hard to avoid the checks.
Of course Auung San Suu Kyi may win the election today and abolish all the controls!