The usual process for that has been to put down co-op races on everyone's schedule (So if you have 4 racers, 4 people put it down). I think there was an issue with SGDQ where Feasel ended up in like 8 games because he kept getting addes as a co-op partner.
Quote from Studio:
The usual process for that has been to put down co-op races on everyone's schedule (So if you have 4 racers, 4 people put it down). I think there was an issue with SGDQ where Feasel ended up in like 8 games because he kept getting addes as a co-op partner.
To put it another way, yes, co-op games count against your 5 submission limit.