Custom Games

I don't know if this is just me or not, but i think it would be really nice if you could make tft custom games, although obvisouly you couldn't start alone, and also if possible being able to make custom games from every rgm ever existed (i know its too much but it would still be awesome; and if riot actually does this, i'd like to point out to not forget any rgm like, besides ultra rapid fire, one for all, i want to remember about dark star, blood moon, nexus blitz, etc.)or at least the one existing at the moment instead of all the ones ever existed