Sorry Croc . . . don't actually have that program and thus can't help you.

Hope you find what you're looking for though . . .

Any samples of what you have to start with and what you'd like it to look like afterwards?
I know that playing around with Levels can eradicate some of the lighter sketch lines while darkening other lines. Applying a Glassuian Blue (0.8-2.2) before hand can help smooth rough areas out as well. And if you're really wanting to smooth some of the rough spots, once you've got a solid black line, just make a selection from the lines and create either a work path or shape and then clean it up with the pen tool like you would in Illustrator.
Don't know what Inkscape looks like, so no help there. I'll try to check it out and see if I can find something like it. ^_^;;;