With the new tactics buttons, it takes about 8 key presses to switch from berserk to coward or back. The old way it took only 1. I like the old way much better, although it unfortunately requires a lot more buttons. Switching tactics settings is something I do often and can be time consuming with so many required keystrokes.
Perhaps just as shortcuts? I personally prefer the +/- method, as it allows me to see the effect each tactic will have... But from jumping between coward and berserk, I could see wanting some sort of shortcut, yeah.