Is a OTR timer hack possible or available?

It would be nice to have something other than a 30 minute interval on the OTR timer. If I am watching and recording something and have to leave for some reason and there is say 10 minutes left in what I am recording the only pick is to add 30 minute increments to the OTR timer. That means I have to definitely edit out the extra 20 minutes if it something I want to keep.

Is it possible? Is it available and I missed it?