I really like BFRPG. It's my favorite retroclone, these days. One of my pet peeves is Thief Skills, though. I addressed this in my supplement a bit, but I've been thinking about this subject more.
I believe 1st level thieves should have maybe 30% in every skill (and the standard 80% in Climb Walls). This wouldn't be a huge boost, but they'd at least be near a 1 in 6 chance of actually performing their job function. Increases for the next few levels would be around 5%, then scale it back.
Also, I think all of the other classes should be able to Hide, Move Silently, and Climb Walls. Give them a flat 10% chance to do so, with penalties for heavy armor. It would make more sense to me, at least. Don't let them do thinks like Pick Pockets, though. Keep the actual "thiefly" skills class-specific.