I don't believe SNES9x has any trouble with PAL games on NTSC. I don't know about vice versa though. This is, of course, dependent on whether it is a full port of the emulator. If it is, I believe it will be fantastic for SNES emulation.
EDIT: And the graphical improvements are just improved resolution really. So unless you REALLY need the highest quality for your 16-bit graphics, V-Console isn't really worth it.