This is one of those issues where there is no "right side" and "wrong side." Look at it from the other person's point of view. As it stands atm, they did get there first, and it is on a first come, first served basis. It's their pop, they have claim; any rage timer is arbitrary. When exactly is it mob holding? Even a 20-30 minute rage timer is 20-30 minutes of just standing around waiting for your turn... is that really a solution?

I believe the solution is to allow for multiple instances of the same popped NM. This way, soloists can take as long as they need, and large groups can plow through several pops as fast as they can.