Yeah, as the title says, a late join option would be absolutely amazing if it were added into TDM. ZAPT has one that it uses in its various gamemodes, and it works wonderfully. I actually have asked Space Guy for this before but he stated that he "didn't like it when it happened to him in TF2" so he therefore "wouldn't let it happen in Blockland." Space Guy is a great guy, and he's always been extremely nice towards me, but this approach to such an issue is ridiculous.
I don't really think a list of examples would be necessary to show the usefulness of this option. My Four Corners game -- a game that's pretty unique on it's own -- would work much better with this option as an example. I've had to forcekill people who join late and it gets annoying to constantly watch who joins and chase the people who join for more lives.
List of things that could possibly be included:- RTB pref to turn it on/off
- RTB pref for # of time available before late-joiners get killed/not allowed to spawn