Not a huge suggestion, but it would be nice if you could target spelltraps based on morality instead of faction politics. Not even necessarily in addition to.
Targeting Evil, Neutral, Good, Non-Evil, Non-Neutral and Non-Good would be handy for people wanting to maintain their morailty, or defend an area infused to a specific morality.
Maybe it would require the user to have sense morality, maybe not. Regardless, I think it'd come in more handy than the current options.
Edit to add: After noticing that buff spells can also be set up as spelltraps, I think a faction only and allies+faction setting would also be interesting for use with those.