I'm really beginning to regret that this forum doesn't let you edit anything beyond the first post in a thread.
It would appear my "98% certain" ideas were 100% wrong.
I just tried an item with these parameters:
PAR0 20
PAR1 20
If my theories had been correct, it would have healed 20 damage, 20 times per second. 400 damage total, so 33% faster than the multibot repair drone. Instead, it repaired really slowly in battle.
After the fight, I went to fix my ship the manual "hard way". I was amazed to discover that my hull, which was about 2/3rds red, repaired in one day.
I now suspect that PAR0 is the only thing that affects damage repaired
during combat. It may be that PAR1 reduces repair time
after combat. A 20 in PAR1 is more than 6 times as high as anything in the main game, but a 20 in PAR0 is very low.
Seeing as how I've been prone to confirmation bias as I experiment with repairbots, this should all be taken with a grain of salt. I could be wrong again. I'll test it a bunch more before making a Tech Transparency 2.2.
Even if my new observations are correct, and PAR0 alone determines repairs during combat, I don't know if PAR0 is expressed in hull points, or as a percentage. Lots more tests to follow.