So you can save up to, say, 10 time selections in your project and recall them from a list. Maybe you could have it that you can save time selections by reference to one or more regions.
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SWS also wrote an extension that does what you ask EXACTLY. Should be around here somewhere. That said, it's a good idea all around. Perhaps some of those functions should be incorporated in to Reaper at some point.
I should look more carefully! I was aware of SWS's excellent marker stuff. Thanks guys. The region thing is cool but you are restricted to one region at a time.