I think with the other rules in UA you can effective balance to your game, such as using the Insanity rules, slots are still used but are considered protected, if a player cast on the fly, not slotting a spell he risk mental damage.
Kamikaze Midget said:Way A: # of High Level Spells
Basically, you can cast your highest level spells more often under the UA Spell Point system. This means that your lower-level spells more rarely get used, and your higher-level spells get used more often