Suggestion for Controller user for ground marker placement

[Magictrix]

This doesn't address the issue at all.

It effectively removes the need to ground target in the first place.

You cannot just center it on target with a macro.

The macro doesn't center it on a target. The macro overrides the need to position the ground target in the first place by just casting the ability straight up on the target -- which consequently happens to be "centered on target with a macro".