This is related to B, but not exactly. The decoders apparently work on the screen only. So on decoders like RS232, once you drag past the start bit, the decoder goes crazy until you line up with another start bit for it to sync on.
This is especially annoying when you trigger on RS232 but don't have the trigger on the screen (or have the trigger in the center). It just merrily decodes assuming the first thing on the screen that looks like a start bit is a start bit.
Example:
1) From the start (text is *** Labtool...)
2) Move some off the screen:
3) Move more until synchronized:
If that's too hard, it would be ok (but not ideal) if you at least had a "move left/move right" button that moved from start bit to start bit. Like I say, related to "B" on your list, but not exactly.
In addition, when setting up an RS232 trigger having an ASCII option (keyboard) would be nice. Or even letting us cheat and open the ASCII table like exists under Decode options.