Well, I haven't playtested them, so I can't say for sure. They were just solutions to a problem. They were originally General spells, and I'm starting to consider setting them back to that.
Cast on the Run should, IMO, at least require still and silent spell, since somantic gestures would be incorrect while you are moving fast, and heavy breathing would disrupt verbal components. The reason I had it require Conceal Casting is that it was pointed out that even if you can conceal you concentration, you still have to concentrate, and so would slow down, become unable to dodge, etc. And so I added this feat to allow running while casting. But maybe they shouldn't be in a feat tree together. I don't know, I really need to sleep. I'll check in the morning.