1) mountX doesn't count tabs as whitespace. To wit...
mount1 v3splash320.vpk
...is good, and...
mount1 v3splash320.vpk
...is bad. Very bad.
2) not a bug perse, but there aren't really any proper comments in verge.cfg. They'd be handy in making verge.cfg self-instructing. Right now it seems like it errors out on the first invalid line, so I put comments at the bottom of the file, but having # and //-prefixed lines intermixed like an apache configuration file would be relatively simple and go a long way towards removing all future confusion.