Hello, a customer has asked us about feature X, and we have agreed to implement it. I can't say when, so i want to stall his issue until the feature is complete, then i want to tell him about it etc. in particular I want to stall the issue so the resolution SLA doesn't breach us for inaction on the issue.
I was hoping we might be able to stop the SLA clock if the issue had a due by date or something? that could work. or another workflow step "stalled" in which case the SLA clock would stop.
I've 52:32 to find a solution! 
Kind regards, Julius