The first part of the suggestion is to expand current marker system for Zeus interface. It's missing "area" type markers and some other stuff that could be there.
These markers are especially useful in marking areas, AOs or enemy defense lines.

Second part of the suggestion (doubt if that's possible, as ORBAT is configured in CfgOrbat) is to add ORBAT editing to Zeus.
It would be awesome and it would allow for really easy marking of enemy units without having to fiddle around with matching unit size to the symbol.