A couple ideas in one
x5
First off I will cover the match accepting.
I do find this to be a great system over all, although, I see a couple problems that could need some attention. First off when you accept a match and someone decline the invite the match Que should drop and start over again rather then waiting for the timer. This isn't a huge problem so if it would be difficult to implement I wouldn't see it being a huge problem to not implement. Second I believe when you accept the match you shouldn't be forced out of your rune page if you are setting them up. Instead I believe you should be able to continue to make changes and be forced out when you enter the lobby, allowing you to accept or deny changes at that point. Other then those two changes that is all I have seen that bothers me a little, if anyone else has suggestion please do add.
{{summoner:20}} Second is game types.{{summoner:10}}
Although maps are nice and make the game have a different feel, I believe they are harder to design from the ground up. I would like to see different game types implemented each day and/or week. Now by game types I mean, arams, 5v5 all same champs, 5v5 all supports, 5v5 all adcs etc. I believe this would give the casual players more to choose from. With this implementation you could set it so that certain modes such as 5v5 all
would allow anyone to play
in that game if they owned him or not. The system wouldn't have to be balanced as it would balance its self seeing as both teams would follow the exact same rule sets. I could suggest many ways to implement this system slowly and possibly build on it, but I believe you are much more capable then I to make those decisions yourself.
Map ideas
As I said before, even if I may be completely off, I believe maps can be hard to implement. I would like to see some unique maps for just the casual player. By unique maps I means things like all jungle, no lanes. Leave the base the same but take the jungle and make it engulf the rest of the map. Could even make it where the lanes would stay the same but their would be wandering jungle mobs and the lanes are being engulfed by the jungle, and slowly the towers would loose health and allow a laning phase that will be forced to a close.
These are a few of the ideas I have that have been thought out well enough to actually put down. Although I have much more then that, I would like some feedback and possible implementation before going too far in depth in the rest.