Quellor

I'd say there's nothing really bad about any of the scrapper secondaries and you could manage with any that you want.

Regen would be more active in that you have to click stuff to keep alive, and looking at the others you got to 50 that would probably be new to you and may not fit your play style, but would be good in pvp zones.

Invuln is a good all around set I think, I've never tried it though, the minimal fx settings would make a more natural looking character.

As for the others you haven't done, I would say elec may have some synergy given a damage aura for extra AoE with Burst, and Lightning Reflexes for the +recharge since one of the gimmicks for kinetics is to get power siphon up more often and stack it by attacking.

I believe the villain respec guy is in nerva, there are 2 arbitors right near each other (check the map) one of them is the guy that grants your respecs.

You can get yor first pool power at level 6, you can select either of the first 2 powers in the pool you selected.

After that you can choose to take the other power in that pool or the first 2 powers from any other pool with a maximum of 4 different power pools on a character.

At level 14+ you may take the 3rd power in a pool if you have one of the first 2 powers already.

At level 20+ you may select the 4th power in a pool if you have any 2 of the first 3 powers already.

Didn't see any of these listed yet, sorry if they were already there.

ledgesit
flashlight
walllean
peerin
protest
laptop
research
holdtorch
drumdance
slap
slapreact
smackyou
batsmash
batsmashreact
assumepositionwall