Limit to CC in ARAM
Rather than mark/dash, a better balance for aram would be to limit the number of times a single champion can be cc'd in any X amount of time. With the absurdity of mark/dash (if it isn't absurd, then it belongs in ranked as well as aram) and how many melee champions have cc it is totally unbalanced with mark/dash. Not only do they have a close on the poor squishies, but they have cc for days. Would be better if there never could be more than 2 seconds of CC on a champion (unless it is a single spell, or a single champion casting multiple times) in any 30 second period.
What that would do is at least give squishies a chance to escape.
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