RFC: throttling threads

[TheDuker]

From a thread a couple of months ago:

@MrWookie

This isn’t something I want to do often, but given how contentious bans have been of late, I wanted to try something different. For those quibbling about the time, the canned options are 15 minutes, 1 hr, 4 hrs, 1 day, and 1 week. There is custom, but I wasn’t exactly sure what to use…