Ascension is basically Team Death Match and its awesome that way. Just pick a better team fight champion. Personally the only champions who could use a disabling on Ascension are trap champions.
The Ascension map is far too small to allow trap spammers like Teemo or Shaco and maybe even Heimerdinger because his Ult turret forces control of an area giving him free control of the middle NPC area when needed.
Teemo and Shaco definitely need to be removed from Ascension, Teemo can just super shroom that tiny map making for a lackluster game of contstantly running into shrooms and forcing builds to be less creative and more MR stacking. And Shaco definitely needs to be removed because his invisibility allows him to continuously escape fights and just capturing relics. Whenever you try to catch the Shaco he just dissapears and heads to the next relic. This wouldn't be too much of an issue but on top of all that his boxes with their fear allow him to stop everyone else from capturing relics because they fear you out of your relic capture and then you get that cooldown before you can try capturing the relic again. And by the time you are allowed to attempt the relic again theres people on top of you.