Zone lines?

I understand not wanting to "ruin the immersion" as it were, but could we have an option to display zone lines or the like? Something akin to what was in FFXII, where you can tell exactly where the zone line is.

It doesn't need to be the blatant, just a slight darkening of the ground or something.

If not for zones, please implement this for Reives. I don't want to be running to one reive just to inadvertently step into another reive and now not being able to participate for 10 minutes. That's just annoying.

It would be nice, as long as they only faded in when you came within like 10 yalms of the zone line.