So if I want to have 15/15, I set VE_DEFAULT_TECH_GROWTH = "15" (or anything higher than that) and put <tech limit: 15> into the skill's notebox? All right, that's quite easy.

The only problem is that it still won't show any numbers next to the skill. It only says "Heal", nothing else (since I set MP costs to 0).
Edit: Okay, nevermind, I figured it out.
Actors and Enemies note tags:
# Tags to be used on the Actors and Enemies note box in the database
#
# <tech skill>
# Setup the skill to use tech point system
That was the problem. I only checked the skill note tags, because I thought "No, don't wanna do anything with the actors". I shall remember to read everything next time. Sorry for keeping you busy here! (But, well, maybe you should put that tag into the skill sections rather than the actors and enemies section for people like me.

)
And then just one more question which is probably stupid as well: How do I restore the Tech Points?