What do you want to see in LoL?

Pause function exists in tournament realm currently, but I don't know if they have plans for introducing it to the public at large. Imo, it's probably not the best idea, since the target audience is a lot broader than the other MOBAs, and some people might abuse pausing so that someone who "needs to go to work soon" will have to forfeit the game. Who knows though, I hope I'm wrong.

As for the meta, Riot has been trying to break it up for a while now, with not much luck. They have the same sentiment as you do, as well as the desire to keep things varied and fresh (replayability).

I don't know. A pause function has worked in WC3 and in DotA2, you get a cooldown on pausing and enemies can unpause after a set amount of time and you have capped amount of pauses you can use. Over the course of probably 2500+ games of DotA, i have yet to see it be abused.

And honestly, another thing i want: New control.
I want to be able to select units that i have control over and manage them individually, using alt and then moving them around is such a bother for me when i'm used to microing multiple units at once in both SC2 and DotA. I guess that's just me, but i feel that the control of for example shaco's ult is extremely clunky. But that might just be me.

And i want the ability to select my allies and see what they skilled and what their cooldowns are.