Sorry, I think I may need to clarify my post

Right now, the beta seems to use something like 10:1 (250x/25x) instead of the regular 3:1 rate, but let's use this for the sake of clarification.
You hit a monster and gain 1000 regular XP. 3000 XP also goes into tactics.
Then, you suddenly notice your tactics are way too low for your level. You choose to freeze your experience and focus on your tactics.
You hit the monster again for the same amount of damage. The experience being frozen, it adds to the tactic pool, granting you 6000 tactical XP, and no normal experience, allowing you to keep up without having to kill other players or resort to negs, and without wasting anything.
To prevent obvious logical flaws, a Focus button would actually be better than XP/Spell/Weapon extra buttons. Then the destination pool would be determined by whatever you use to attack your foes (enable Focus, cast Firebird, get Magery XP ; use fencing sword, get Fencing XP).