Right now, you don't even want to do traps because the rat is a massive xp ball worth more than the paltry xp you get from disarming a bomb.
Considering that this is the ONLY use of the skill...
*Do not nerf rats, allow them for teams who do NOT have someone capable of trap disarming.
*Give 1k xp PER QL of the trap that is disarmed, split among the team normally (aka for a ql200 trap, you'd get like 167k or whatever).
*This seems high, but think about it, it's the ONLY use for the skill, and a 200 trap requires a lot of skill. Any less xp and teams will NOT wait for you to disarm anything, they'd just take the odds on a rat popping up.
There is absolutely NO reward for this skill right now, in fact there is actually an XP penalty for disarming traps instead of fighting the occasional rat. (3 rats in a 190+ mission will give ~150-200k xp, disarming 8 traps will give you like <50k).
John