I would like a pencil tool or something similar to redraw a waveform. Auto Heal works great, but sometimes you need to smooth out just a bit or mirror the surrounding waveform. Protools, Cubase, Sound Forge all have this functionality.
John LaSala commented
Seconded! The sad thing is, the program used to have exactly this back when it was Cool Edit Pro. They got rid of it for some reason. And boy do i wish they hadn't.