Some of my friends and I have started to run this game in 2 Player over Fightcade and our times are starting to improve, so I was wondering if these runs would be submit-able or if there is an established protocol for online 2 Player runs?

Streets of Rage 2 & 3 have Co-op runs that are done through Fightcade, so I think it should be allowed here.

Contra Hard Corps, Fightcade allowed. I don't think there's any point in banning it.

But it's up to the moderators to decide.