You can house-rule it how you like. I will myself test her in both ways. I just posted here the errata from the original designer of the game as posted on Edge Entertainment forum.
As for myself, I'm already house-ruling a few normal character that are FAR TOO WEAK in comparison to others on my opinion.
Paladin and Dark Paladin: Rised their Speed to 3. Light and Darkness creatures are pretty rare, meaning you won't get much use of their special ability and for 3Combat/2Speed they simply are outrageously bad. With 3 Speed at least they don't drag your party down.
Mentalist: Rised her Speed to 4. C'mon, her ability is simply awful and she comes with access to only Magic. Again, with 4Speed she may find some usefulness at least for missions requiring speed checks.
Arcanist: Let the party re-roll ALL combat rolls once (hence no Tap required). 2Combat/2Speed...she's definitely the worst existing character. At least her ability may come in handy like this...considering having her in your party means having an average -2 on complessive stats (if not worse), it's a fair trade.