Directing traffic to specific member of a pool

Interesting requirements...How are you accomplishing servers in a pool just for service checking? Or do you need the iRule to do that as well?

You can force a pool member selection as shown below(inside the HTTP_REQUEST event).

 pool [LB::server pool] member $ip $port 

I was initially thinking priority group activation, but that will not satisfy the requirements stated above. Obviously only you can understand what the actual needs are, I just feel like a better explanation of why the requirements are how you stated them would help us come up with a better solution.