Modders have been working on formation kits for some time--since early with the original M&B in fact--and there are a few different kits out and about in The Forge. (Kits are 'mini-mods', essentially source code that can be incorporated by other modders into larger mods or by individuals into their own mods or the Native code.)
The most current and active formation kit is done by Motomataru (edited and greatly enhanced from Mirathei's earlier work). Notably, it is used in the mod Brytenwalda. The kit is discussed toward the end of
this thread and the most current download at time of post is found
here. You can add it to Native's source (or any mod's source for that matter) relatively easily as it uses the
ModMerger Framework.
The full-conversion (Dark Ages Britain) mod Brytenwalda uses the formations coded above, as I mentioned, with no extra work required to use them.
Similarly, the self-contained mod Custom Commander adds some formation-like things, as well as a number of further modifications if you want to give that a whirl. (It is also merged with a version of Diplomacy in the "Open Source Project Mod".) All of these are available in The Caravanserai.
@Spazzimus: so, yes, modders are working on answering the cries of the masses--which is apparently what they should be doing? (Or perhaps they are just tinkering with finding ways to add useful features to the game, which frequently many want...in any case...) In another "modders at work" update, per your queries in the King's Court:
beta Pre-Battle Orders & Deployment. (The source code kits:
Pre-Battle Orders and
Pre-Battle Deployment).