I'd very much like to have a button that would reset all sliders to their default values. I sometimes (actually, more often than not) create an abomination and would like to start over. Unfortunately, that currently doesn't seem possible. The semi-random initial values are often somewhat annoying too.
Other additions I would welcome:
- undo button that would remember all the past steps
- a way to export a character preset (I'm sure this was asked in past...)