There should be points for defending a cap zone
Attackers should get extra points for being in a cap zone for a certain % of time
Spot on Melipone.
Glad i found your post because i wanted to suggest similar. I thought of splitting the cap meter in half, to keep things simple.
Cap from when less than half way point till end and get 10 points.
Finish cap off from after half way point and get 5
Likewise for defenders;
Bring a cap back fully to you team's control from over half lost would yield 10 points
If opponent had less than half capped when you arrive and help re-secure it and you get 5
Why should someone get full 10 points for diving in zone last second after his teamates have fought long hard to swing the cap their way?
I was thinking about idea of crediting people if they contribute to a cap but die/leave before completion - but this seems complicated. The info might be have to be stored for some time (caps can be contested for prolonged periods) and you might re-enter the cap zone to finish it off after respawning and confuse matters.
Maybe best solution is if your contribution would be 'held on record' for say 5 secs after death or leaving and you still score points outlined above if team finishes job in this time.
This seems fair that you posthumously get credit for your brave capping effort under fire, and also you often you leave a cap zone early to get a better position when it's clear the team is overrunning it en mass.
I recon killing an enemy which is in an active cap zone should score more points as well- 2 being an obvious figure. I had it in my head that this was the already the case- but i might have been imagining it or phaps a beta was that way. I expect this has been mentioned before somewhere.
MG resupply is a tricky one- some cases the effort is vital should be highly rewarded, but other times it can be a cheap point builder. MG-s who call for ammo but keep running create a mini Benny Hill show sketch.
I crack-up when i see MG chasers . Sometimes i'm one of them...