Support in the Last Hit Game

Lets give the gold generation tier 1 and tier 2 items an active. Give it a mark ability that only works on minions (lasts 0.5s - 1.0s). If the marked minion is killed, the person who marked is given a bit of gold and / or experience, or causes a minor burn dot on the ADC?

This way the support can play the last hitting game by trying to get the ADC to kill a minion they just marked. It would also help provide a means for more active experience gain for a support and give the basic gold generation items a more refined purpose.