Defense mission open rooms

[(PSN)TOXlC_TAlNT]

When leveling guns on hydron. Everyone seems to leave after 5 waves. Making it very difficult to get to higher levels to level guns up faster. 

Keep the rooms open so people can join after level 5 and if people want to leave early they can and if people want to stay later then can without fear of dying or taking an extra 10 min to get through the next 5 waves because others would be able to join. 

[LucianDeRomeo]

This has been addressed before and will likely just never happen without a considerable change to how mission queueing works. The thing to try is to give some sort of option to merge non full groups at the same or similar wave to reform the mission but even that I'm sure if chock full of issues, especially given all the issues people tend to have with normal host migrations.