simple rule rule of thumb no flying in such a way as to impede others from taking off or landing and or flying in such a way as to impede others from flying normal circuits and or taking off and landing problem solved, hogging the flying space is hogging the flying space be it 3-d or whatever else, every paid member has a right by membership to his or her flying time "JOINTLY" with any and all other members, membership does not give you exclusive rights to airspace just because you were there first.
The way I look at it if you want to hover your $5000 comp arf in the way of me landing my $500 twist well ok I can recover from a $500 loss alot quicker than you can recover from a $5000 loss so have at it this is shared airspace and common courtesy rules apply