I'll look into adding this feature soon, possibly next update. Thank you for the feedback. :)
I'm unable to reproduce the point buy bug (That's exactly the number of points that would change if you exchanged perks, did you happen to swap your perk as well?), but I've made it so instead of reducing and adding points as they're exchanged, they're just recalculated based on how many points you have total. In theory should fix any issues with that in the next update.