Not a bad idea.

i only know of the 3 minute rule.

i would like a draw button as well! if one person disconnects early game one should be fair enough to make it a draw or a not counted game. btw. the option of custom games that dont count would be really great to introduce beginner into the game.

I'd say you are generally correct.  I personally would use a feature like this to have unranked matches.  It would work great in premade v premade for me, anyway (if someone on the other team had a crash afer 5 minutes, etc).  I doubt it would get as much use in a PUG though as you'd have to get everyone to buy in. 

common sense.

if you are winning and someone on the other team disconnects, ragequits or goes afk etc.. would you draw the match for them? YEA RIGHT LOL.

ive also spent 30 mins waiting to start a game and i dont get stats for it? FK OFF.

I would prefer the option to play unranked custom games but a draw option would be nice if it isn't too much work.

i would use that function. well, there are situations in which someone ragequits. but i often enough had games during which someone dropped without it being decided or when the game just had begun, the 3 minutes where over and yet no one had been killed.

i can just speak for myself but yeah i would use that function for sure!