[gridengine users] slot quota dynamically ?

[Schmidt U.]

Dear all,
is there a way to define slot quotas dynamically ? By default I set the 
RQS to
{
    name         slot_per_us
    description  "slot limitation"
    enabled      TRUE
    limit        users {*} to slots=200
}
But sometimes users have a huge amount of short jobs, because of that I 
think about a solution similar like "slot * walltime"
Can I add a kind of variable instead of fixed number ?

buudo