Subtool Folders! Folders within the subtool palette would be very useful. Like folders in photoshop layers.
Save-able/Loadable Render Settings. Holy cow would this be swell!
Brush: Save Current state (so I don’t have to keep making and reloading and redo my custom interface)
Blur Mask/Sharpen Mask/Grow Mask etc : would be good to be able to determine by how much. Maybe I just want to blur a little bit, not by a ton. Or grow the mask selection by a few pixels, instead of what seems like a random amount.
Mask by Lasso : would like to have a settable edge softness here too.