Yeah I know thats a bummer, but what i think i might try is this, in the .sqs where u post all ur AddActions name them differently...
Example you named ur player TEAM1 and your Freinds player TEAM2 so just save it as Menu1.sqs where all addactions will be place only for you and Menu2.sqs where all actions will be loctaed for team2 player than in the players init just put - this [] Exec Team1.sqs - for player 1 and- this [] Exec Team2.sqs - for player 2 im not sure if this will work but it should, ill have to test it soon...
its 4 am and im lazy to check currently since I spend long time on working mission and ran into the same prob u have