Thanks everyone for your feedback. I am going with the following house rule:
"PCs and Solos can spend an Action Point at any time to end a status effect (Save Ends/Till End of Next Turn/etc)"
I'm persuaded that letting Elites do it could unfairly harm certain PC builds. After 7 sessions my 2nd-3rd level PCs are yet to face a Solo, but there's a Young Green Dragon they may be up against soon and I wouldn't want it locked down too fast.
"PCs and Solos can spend an Action Point at any time to end a status effect (Save Ends/Till End of Next Turn/etc)"
I'm persuaded that letting Elites do it could unfairly harm certain PC builds. After 7 sessions my 2nd-3rd level PCs are yet to face a Solo, but there's a Young Green Dragon they may be up against soon and I wouldn't want it locked down too fast.