Matchmaking suggestion

Talking about Halo 3 matchmaking:

When (if) players are found, and we get to choose from three maps/gametypes… can you change it so it’s either all three slayer (swat, snipers, team slayer, ect…) or all three objective?

What happens is that the map with slayer is ALWAYS picked. So the few of us who likes objective games never gets to play. We try to play Bigteam (where objective games are more commen), but we always just sit endlessly searching…