I can already hear the responses being typed. Correct me where you think I'm mistaken.
As I recall in WoM there was a rather unbalanced trait available in Sov creation that let the army move at the Sov's speed on the overland map, not at their individual speeds. I propose you make this same trait inherent to all champions.
What We Want: The game wants to have single champions, leading armies of varied troops with different abilities, and distinct strengths and weaknesses into battles, for fun and varied tactical play. We want players to get excited about having a building that produces powerful, but slow moving monsters.
Having a slow unit drag my overland speed down does not encourage me to take it. Champion speed has slowed way down, and losing even a square of movement is painful. I find I'm building all my units in the same way, with the sole focus on being able to keep up with my champion. The result in battles is that all my units are so fast, they run circles around the AI. It might be awesome to have a pet drake, but if my entire army moves at 2 for taking him along, he's never going to see battle.
What we dont want: Champions soloing the map without armies, homogenous armies, or armies to generally be as effective without Champions (There should be compelling reasons to have a Champion, even when armies become powerful on their own).
Let me see If I can address the most likely objections:
1)" Speed Kills " : Yes, speed is a powerful ability. Yes, we want to keep speeds from getting too high both to slow down the pace of the game, and also to keep the AI from being blown out, because it has no hope of predicting the moves of an army that starts getting into to 5-6+ speed range. But that's already being addressed on the Champion level. Champions are much slower to get +speed abilities...it's actually easier to build faster units in the early game now.
If armies are supposed to be led around by champions, you need only gate the speed at the Champion level.
It also gives an inherent value to having a Champion lead your army, as opposed to making your own army, and just riding out without leadership. Rationalize the speed as your Champion's logistical and command ability, able to coordinate troops in the field. Overland Stacks without Champs should be subject to the speed of their slowest member, as normal.
2)" But Units have these + Speed abilities in the Designer...There needs to be a reason to build fast units" Yes, and those traits are still valuable. A unit that moves 3 or 4 spaces on the tactical map is very powerful and flexible. You would still find building troops with these traits very worthwhile. Not to mention the times when you might need to operate troops autonomously, for instance a garrison defending a city's buildings from attack. It's why you send out a group of fast riders to stop a marauding monster, not a slow moving drake.
But as it is now, I'm only building troops with speed in mind, passing over other more logical traits for a unit. It discourages the taking of powerful, but slow moving units into battle, and discourages tactical variety and depth. Wouldnt it be nice to design a unit not worrying about whether you can ever take them into battle? Move speed should express itself on the tac map, not the strategy map...not as long as Champion speeds are already being throttled.
You might then even consider dropping base movement speed for designed units to 1. This gives added value to the +speed items, makes you really have to commit to build speedsters, at the expense of other characteristics, and gives greater tactical variety making it more likely to see slow moving but powerful units.
3) "I'd rather see speed split into two different numbers, with X is the square root of..." It's possible so would I. But I'm trying whenever possible to work within what we already have in place, rather than requiring systems to be totally ripped out wholesale. This seemed an easy and logical fix within the existing framework, but then I'm probably looking at it myopically.
As always, if you've actually taken the time to read this, I appreciate you doing so. Now, rip me apart!