It overlaps a little bit with URF, but I would really like to see a 'Fast Forward" game mode
Basically it would just be a Summoner's Rift game where everything is twice as fast.
- Double movement and attack speed.
- Base cooldowns are cut in half.
- Death timers are halved.
- Double health and mana regeneration.
- Halved camp and plant spawn times.
- Double ambient gold.
- Double minion spawn rate.
- Double tower attack rate.
- You get the idea.
I love URF, but fixed 80% CDR and no mana costs means that a large number of core items are simply not worth buying. It also has more significant balance outliers, because champs who are spell reliant have a disproportionate advantage throughout the entire game, and power budget allowances due to having large mana costs for spamming abilities become meaningless.
In a game mode where every champions' increase in power is more or less on a consistent scale with each other, a lot more champions would be viable in Fast Forward (FF) mode. You get the same exaggerated pace and gimmicky laning phase, but you don't feel bad for picking a certain champion, and you can explore a lot more options over a large number of very brief games.