How it would work:
#1 Lockdown thingy, open to a tab that says "private match"
#2 Choose the rules (AA on/off, Trinkets on/off, Uv's on/off, ce rev on/off, the tier, spectators on/off)
#3 Choose the map (NO FROSTBITE PLOX, "random map" is an option)
#4 Choose who to invite. it should work like a party, with the options of:
-Public match (anyone can join)
-Allow friends (friends can join)
-allow guild (guildies can join)
-private (only invite)
#5 Choose the teams (obviously must be balanced to start 1v1,2v2,3v3,4v4,5v5,6v6)
#6 (optional) Betting. Leader chooses amount everybody has to bet, and it goes in a pool. the winning team (not including leavers) gets the money, split equally.

Why I want it:
-Easier to coordinate 1v1's, tournaments, have fun with friends, do bets, etc..
-No downside to it (besides the devs having to do some work ;-) which they should anyways)

Update:
Being able to kick people (and they can't rejoin without your invite)
Being able to move people on a team (and a "lock to team" function)
Everybody needs to press the "ready" button (obviously)
Limiting the amount of spectators
Delay on the spectating to prevent cheating (5sec delay, 1 minute delay, etc..)

Feel free to post any suggestions and I'll add the ones I think are good.