[JustSimpleUser]

I request plugin, that can change mvm map gamemode to arena or etc

You know.. removing or replacing tf_logic_mann_vs_machine and over map entities without recompile.
Please, this is not stupid idea for this request, i just want it to release my ideas
Thank you.

[Potato Uno]

Yeah no, it's not that simple to do. You need to rewrite the map logic and a shit ton of entity work for the map to work properly in the new mode (and make clients download a new map). All of that requires hammer or a lot of work with stripper.