I have 5 accounts with 2 as the RaF root veterans, and any time i see a collection quest for not too many things (like in shimmering flats there are about 5 of them), I just do it on the 2 vets then eventually when they pop ahead a level I just grant one back to the other to catch them up. This way I get to level even more from questing with only 2/5 of the collection work.

I'm sure this would work in a pair too - just collect with the vet guy and grant now and then.