Here's a famous guy with partially paralyzed fingers, and he did pretty damn good: http://www.youtube.com/watch?v=LoIJ4W7kXiQ&feature=related

Django!

Just for you to get inspired :).

It's hard for me to tell exactly what you can and can't do with your finger, but I'm positive that with enough time you will automatically develop workarounds that will work well for you.

Since it's your index finger I think it's not too bad, since you use that so much for barring anyway. It doesn't interfere with anything behind it (lower frets). If it had been your middle finger it might have been worse.

/Ben