Customization of party and being able to do so before match is a must have. So you can load ur whatever setup u want. But these are propably coming being that obviously a must.
You should add some presets too with customization, like certain levels and gold. For example lvl 10 characters 1000 gold each etc. Gold number is completely made up but just for example. And make alot presets like this. Lvl 3, 300gold - lvl 7, 700 gold - lvl 10, 1000 gold - lvl 15, 1000 gold - and so on.
Then the lobbies would look like this - MrPwnerz lobby, preset lvl 3
And u just join and load one of ur lvl 3 parties u made.