I'm thinking about house-ruling away multiple attacks and instead using the Star Wars Saga Edition way of dealing with attacks which is:
1. Use highest BAB attack bonus only
2. Add half your character level to damage.
Pretty easy house rule to supplement. All creatures without classes would just use half of their HD for damage bonus. I liked this about star wars: saga edition, and figured it wouldn't matter too much if I used it in Pathfinder RPG.
What are the foreseeable problems with this adjustment (if any)?
I'm not entirely sure about this but it seems like it would be a touch low for damage boosting. This sort of damage boost is already doable just by taking vital strike, greater vital strike, etc. With iterative attacks players in my table generally do significantly more damage than that.
That's a good concern. I've never got our group to play enough to reach level 10+. Just started getting back into pathfinder. I don't actually have my book with me to reference those feats. Would you think a higher damage bump then? Maybe steeping higher as levels progress (so low level characters aren't dealing out loads more damage)?