Spawning in a Mantis

Why can’t I spawn inside of a Mantis, I wanted to create a Mech Combat gamemode until I noticed I can’t even select the Mantis.
Before you say just place a Mantis in front of each Spawn, I already know that, I prefer if Players spawn in them.

I don’t think it’s possible at the moment (yet).

We’ll just have to see if 343 makes it an option in the future.