The comma as a shortcut ... How ?

[cyran0]

Hi everybody, I'm trying to remap play_prev and play_next actions on shortcuts comma (,) and period (.) . I understand that commas act as separators but is there a trick to use one as a shortcut ?

Btw, fantastic frontend !

Thx

PS
I forgot to mention my setup : Powerbook G4 Linux/Gentoo