It's not really a feature request so much as a question of whether it can be done.
How does Mandate stack up to GAE and MG? What's is its goal as far as development?
This is certainly possible, depending on how efficiently and cleverly its implemented and whether your computer is strong enough to handle it once it works.
MegaGlest is, as far as I am aware, focused primarily on a stable cross platform multiplayer experience.
GAE is designed to function as a sort of engine for a broad range of standard RTS games. It may be getting decent multiplayer soon.
Mandate is designed to support exploratory strategy games rather than RTS games. It can or will support various kinds of ai, automated unit control and so forth. As well as a very broad range of other nonstandard features. It should allow for RTS games of many base templates, such as Battlecry like games, Majesty likes, starcraft like games and more. It eventually will also support MOBAs, city builders, and such. It may also support a rough form of RPG.
It also should allow for various features from a broad range of strategy genres such as King of Dragon Pass style events/stories and other strange things. Faction anchored AI is also possible where one faction can play like Majesty, one like an RTS, one like an RPG, and one like other things. Such as being able to do as you asked, allow for a sort of commander type scenario where you create general units who can control a wide variety of things cleverly.
On the downside is that I have no plans for a stable multiplayer, indeed given the features I plan for and the kind of games I like its quite impossible to maintain stable multiplayer. It also lacks precise focus I suppose as well as me being, as far as I know, the least traditionally educated or experienced developer. I am also somewhat unstable development wise. I fail to work consistently and I flit around from feature to feature leaving several unfinished or unpolished.