I would probably not use the voice chat option. However, I think it would make dynamic q less traumatic for solo players. I don't gain any pleasure from hearing 12 year old cry cause they got beat in lane, but if the difference between winning and losing is a small amount of communication, no reason premades should have that advantage all to themselves.
I'm not sure about adding more than ten players to a game. I noticed longer load times, and more lag spikes during hexakill. Perhaps it just me, but adding in more might mean connection issues for some.
I play a lot of hiemer, and wouldn't mind seeing a change to his passive and ult. His passive is weak early game as he lanes solo most of the time. His ult can only be used to empower an ability that is already on cooldown, so if he has already cycled through his abilities, his ult might be unusable during a key moment in a team fight. Position is key with heimer, as his turrets have a pretty big cooldown and cannot be moved, making him one of the least mobile champions in the game. Made worse by the fact that he has no disengage (Maybe and ulted Q with Rylai's), and his only engage tool is an ulted E. It's hard to take a tower with heimer defending, as he is pretty tough to dive, but other than that he doesn't offer much to a team comp.
I think Ahri is in a good place. Same with Liss. Kog could certainly use some changes. I understand the after death damage dealing on Sion and Karthus, but I don't get rewarding an ADC for death.
Wouldn't mind a look at Annie's E. It's only really useful for stacking her passive, and procing Rylai's/Liandries with tibbers. She's just too squishy to need a defensive ability.
But, these are just my opinions, and im only bronze 2.. so what do I know.