Well, in 2008 and with the visuals of Gtk I'm simply not willing to look at old X-GUI hour for hour. If I'm doing graphics I'd like to look at contemporary visuals and I don't mean glossy buttons and rounded-corner icons by that.
Despite that, Inkscape is nice and in many ways rather efficient to use, not too much to click even though it's a graphical application (Gimp is in several ways more click-intensive), the development seems to really go ahead and I can do my stuff.
If I compare my behavior of usage Xfig - Inkscape with Image Magick - Gimp, I still use Image Magick regulary and for many specific image manipulation application I don't like to do in Gimp. With Xfig - Inkscape, I don't miss anything in Inkscape where I actually want to open Xfig instead for.
But this might be due to my specific requirements and taste.
Inkscape shortcuts can be changed in "default.xml" (/usr/local/share/inkscape/keys/ or similiar) - basically it looks like this:
<bind key="F4" action="ToolRect" display="true"/>
<bind key="r" action="ToolRect" />
<bind key="R" action="ToolRect" />
See this URL for details: http://inkscape.org/doc/keys046.html
(or click "help" -> "keyboard and mouse" in Inkscape)