Mark summoner spell interactions

So i was playing Darius on ARAM today and noticed that i could mark someone, begin my q, then dash to them while still channeling, allowing me to hit the as soon as i arrived without being vulnerable during the channel. I then noticed that if they were too far away, i would finish channeling while still traveling and perform the attack mid flight to no effect. I thought it might be fun if i could damage enemies i was passing by with the q while dashing if it went off before i reached my destination. The amusement of seeing Darius spin across the map like a giant Tryndamere was amazing, but the disappointment at learning that i had effectively wasted my q because it did no damage while i was en route was disappointing. I feel like the ability to damage enemies while dashing would be a nice addition to ARAM. Garen marks the back line, DEMACIA, dash, hit everyone a bit, beyblade status achieved. I don't see this being a balance issue considering the speed at which the champs travel while dashing, combined with the fact you are diving behind their team. Anyone else have any thoughts on this? I feel the number of interactions possible are pretty sufficient to at least humor the idea and possibly put it to test on the PBE.