Sounds like LoL is the wrong game for you. I like the changes in LoL, rather than just copying DotA. There have been many similiar threads, and the changes you're proposing won't happen.

why bother copying dota? lol>dota for me and i was playing dota for like 5 years... and now i canst play it..!

riot knows about denying, but they didnt brought it into the game because it makes early game for melee champions even harder, while denying is easy for range champs.

exactly they say

"1.It enlarges the early game imbalance between ranged and melee Champions, and we think it is more fun for all Champions to be at least somewhat competitive at all phases of the game.

2.It leads to passive play, and slows down the game. We feel that high-activity; high-action faster games are more fun. By not having denying, there’s a stronger incentive to push. Additionally, it prevents strong lane control which is ultimately about passive play. Team fights more than anything else are what make this genre fun, and faster games mean more team fights.

3.It is weird. Killing your own guys?"

Nobody needs denial.

Voting game modes would be nice, sth against double champs too, but it forces ppl to play what they dont want, it only worked in dota because they had plenty of choice, imagine most of the rotation being picked and you being new to the game, there would be 1 or 2 champs to pick sinec you didnt buy any...

Backdooring could be avoided by having to be with creeps to damage the towers, and by the nexus being able to attack.

Denieing is just passive play, it s*xs.

Game modes is being worked on, season 1 should add 1(is comming this summer).

Backdoring is a legit tactic, there are alot of ways to counter it and see it comming. Its fine as it is.