I'm going to preface this by stating that I have significant vision impairment, so if some of these requests don't sound like they make sense for the typical user, just remember where they're coming from.
Side-by-side menus: instead of having the two menus on the left and right sides of the screen, would it be possible to have them both on the left? For me this makes sesne because I don't like having to scroll to one side of the screen to select something like Forehead, head shape, etc. and then go all the way to the other to adjust parameters--too much back and forth. The result would be that the viewing space wouldn't be centered as it is now, but that's not of concern to me.
Keyboard entry for sliders: If I want to see how a parameter morph makes the model look, I'll slide one to the right or left--but I can never get it perfectly centered again after that. Undoing is fine in the short-term, but If I've gone several steps into the process of making a character and want to zero a change I made earlier there isn't an easy solution (that I know of).
A change to how mouse controls are set up: Not sure if I'm just a dummy on this one, but I wanted to switch the right and left mouse button functions in the settings. The problem is, I only have three mouse buttons, and if I wanted to change left to right, it tells me "You can't do that, that button's already in use fool!!!" I could probably do this myself in a config file or something, but this suggestion's more for everyone else.
Option to lock scrolling when moving the camera with the mouse: I use the middle mouse button for moving, and the wheel for scrolling. Yet it seems like sometimes when I'm panning the camera, it also likes to zoom in and out at the same time. Seems like there should be a way for only one type of movement to occur at a time. Set a flag whenever a certain movement type is being used, and then don't allow any of the other control actions to take place if all of the flags aren't cleared--just off the top of my head.
It's possible that some of these things have been addressed already in one of the nightly builds--if so, then I apologize. This is also based on having used the program for less than an hour. Finally, though I've never formally worked with python before, I have experience with other scripting languages and GUI design. If some of these features seem like too much trouble for what it's wroth, but you know how to go about implementing them, let me know and I'll see if I have any time in my busy schedule to look into it.