I have an honest suggestion, Riot. :3

Now, before you say no: think about this:

Riot, you cited your main reason of not having urf mode all the time is that you would have to do maintenance on it and continue working on it, like dominion, and you dont have the ability to do continued maintenance and balancing for new champs to three different permanent modes.

My response is, DELETE dominion and replace it with permanant Urf Mode.

Nobody would complain. Problem solved. Seriously, consider it.