have you looked into scheduling operations? say, maybe, create a schedule for "now and schedule for later" where "later" can be far into the future so it doesn't really trigger. Then everytime you want to trigger the op, you go into the schedule, and just save it again (without touching it) so it triggers "now and later" again?
Editing existing operation schedules is currently not supported in the new RHQ 4.x GUI. I'm not sure if it was supported in the old 3.x GUI.