Has anyone else house ruled the Soulknife as having a full BAB? I know I plan on doing so the next 3.5 game I run.
I think of Soulknives less like Fighters and more like Monks, so I've never boosted their BAB- hit & run skirmishers, not toe-to-toe warriors.
However, I don't think it would unbalance anything appreciably if you did that (for either of those classes).
The one HR I have done consistently for Soulknives is I don't make them take the full round action to reshape their mindblade every time they manifest it- in effect, the blade "remembers" the last shape it took. Combined with the Soulknife Feats in Dragon #341, it adds a nice little boost without "stepping on anyone's toes."

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.