It would be nice to see parties encouraged, especially with members other
than the ideal minimum combination. Frequently, exp parties will be 3 offtanks
and a healer, or similar min-maxed combinations.

How about coding a 'party bonus', which gives +1% experience rate for each
unidle member (greater than 1). This would create up to +8% experience rate
for a 9-man party if all unidle. This might make it worthwhile to take some
'non-ideal' party members.

I'm not saying i don't like this idea, if anything i strongly support
encouraging different kind of party formations. I just don't think "bonus for
unidle members" is the way to go, because all it encourages for is creating
triggers to keep you character unidle. But, what if the bonus is based on
amount of different guilds represented? That is, of course, if something like
this would be implemented. Which i don't think is gonna happen, i just want to
keep the conversation alive because the idea doesn't completely suck.