I've always thought this about Dark Heresy. And, well, most other RPGs I've played. The idea that people assisting on a test don't even have to touch their dice, and that they just provide a boring flat modifier is really unengaging to me.
What I'd propose (and I haven't playtested this yet, so I doubt it's too balanced yet) is to make it that everyone involved in an assisted test make a roll. Then you calculate everyone's Degrees of Success, or Degrees of Failure where applicable. Add them all together, with each DoF and DoS cancelling each other out. Then, count up what's left. That's the DoS or DoF of the assisted test.
Say for example that the whole party is coordinating to try to get their Chimera repaired and ready to roll out. Each player rolls their test, each applying applicable modifiers for their items, skills, etc.
The first party member scores 2 DoS. The second scores 4 DoS. The third does particularly badly, scoring 5 DoF. And the last party member scores a single DoS.
That's 7 Degrees of Success all up, and 5 Degrees of Failure. The DoF and DoS cancel each other out, meaning the end result of the test is 2 Degrees of Success..
Thoughts?
Edited by Tom Cruise