Just did a quick test and found a minor bug:
1. setup 2 Emu nand paths (probably unrelated but that is how I tested)
one is SD:/nand and one is SD:/
2. SD:/ gives an error - Face.lib missing. That is expected since I don't really have a nand at sd:/ but what is Face.lib?
3. Try to delete Emu nand path 2 (SD:/) by blanking it (clear, backspaces) from the setting menu but it always stays in the setting. No biggie, I just use a text editor to edit the config file directly and that fixes it; but a bug is a bug, right? - once you enter something to a Emu nand path, you can't simply delete it; might happen to other settings too.
Another interest thing is after I blank the input field, I try to press "Enter" to see if that makes a difference. Each "Enter" will make the cursor backspace once and the end result is still a blank line and the Emu nand path 2 remains as SD:/
Why I would enter a non-existent Emu nand path in the first place? Well, since there is 3 Emunand paths in the setting, its tempting to see what the outcome would be.
One last note, the icon bar for path selection (SD, USBs, Wii, Mii, Emunad etc) is a bit tight with only 4 icons on screen. Of course, it would be impossible to show all icons especially for ppl with a multipartitions HDD and GC raw images but extending that to show 6 or 7 icons would be more convenience if re-coding it isn't too complex.