couldnt find anything in the dev notes forum, admittedly it doesnt go back all the way. SG did a write up on them here, but its mostly already known stuff-
http://elementscommunity.org/wiki/basics/abilities/ . interestingly however she herself breaks down active abilities into the two groupings. if we were to come up with new names for the three categories of abilities i would suggest
A) activated - requires clicking, can be lobotomized. example : Phase Spider
activated : past participle, past tense of ac·ti·vate (Verb)
1. Make (something) active or operative.
B) innate - does not require clicking, can be lobotomized. example: Vampire
in·nate/iˈnāt/Adjective
1. Inborn; natural.
C) perpetual - does not require clicking, cannot be lobotomized, can potentially be removed by specific abilities such as web. example : Mummy
adjective /pərˈpeCHo͞oəl/
1. Never ending or changing
And after this breakdown, some creatures' skills may make more sense switching categories. And I would suggest opening it up so you can have multiple innate abilities and mutliple perpetual abilities, but only one activated ability, as the way the game is currently coded you cannot select within lists of abilities to use. although that may be interesting to do, it will probably be a coding nightmare.