Training mode is great, thank you Riot, it is just missing a few essentials.

Playing with friends

An invincibility option opposed to regenerating health

Spawning Baron nashor

Removal of the really weird 0.5 second cooldown as it makes spamming spells feel clunky.

Access to all items. ( For example, jungle items without smite as a summoner spell).

Seriously though, this is amazing Riot, thank you <3