I'm currently using this great extension (yes, it does work fine for me on both the development and stable versions, on a Windows XP machine). It's great for exporting a large amount of icons from a single file - I used to have to export from inkscape to photoshop to break a single file into slices, but now I can skip that, which is a great help.
Now the way I work with it, is like this: I'm creating a grid of icons on a single file. So, I open a new layer and name it "slices". On it I draw 16x16 pixel rectangles and give them appropriate icon names. now on the layers dialog I lock this layer and change its opacity to 0%, and I'm free to draw anything I want on a layer above that. Just before export I group all the stuff on the top layer, so when I run the extension I get PNG files for all my icons plus one large file with all of them at once, which I can delete.
So it's all well but I was wondering if there was any way I could edit the python script so it would only look for objects on a single layer named "slices". I'm not looking into any fancy change in dialog, I was just wondering if a quick hack of the python script could do that. I'm not a programmer, but I do have some background in scripting, so I tried to look a the script and the correct place seems to be the for loop at the end, but I'll be damned if I know what to put in there to make it do what I want.
So, if anyone can help me and it's not too much of a bother, I'd be really hankful!