Alright, I'll give it a shot myself.
As it stands, Rohan has all of their best units pooled in the cavalry section. While it does not have to be bad, it automatically means that Rohan's gameplay becomes one-dimensional and even more one-dimensional by your opponent because he will then spam pikes to naturally counter them. While this is sound and logical, Rohan suffers greatly from this, because their counters to upgraded pikes are very few. The only real counter they have are the limited by 3, Westfold Swordsmen, which are buggy in their combat behaviour and Rohirrim Horse Archers, which are great overall, but fail to deal with the extremes such as the Dwarven Veterans, Gondor Tower Guards in Shield Wall formation, or Uruk Shield Bearers attached to squads.
Now, besides the raging inferno about buffing Rohan cavalry in the balance and suggestions section, I think it would be better to buff Rohan's counters to pikes via an additional outpost first and foremost. How so? Because if you field the proper counters, your opponent should not be able to spam pikes in the first place or any unit for that particular matter.
Here's my attempt:
I like the idea of some kind of Town Center. It will be the cheapest Outpost available for any faction, priced at 900-1000. It will focus on improving peasants to allow them to better accompany Rohirrim in MG and LG.
1. The Outpost can, by default, or via an upgrade increase the income of all peasant farms by 25-30-35%. It's a rough estimate, but it will do for now.
2. Through another cheap upgrade or by default, Peasants have their banner carriers replaced by Yeoman Captains that boosts the appropriate battalion with a 20-25% damage increase in combat against their counter. So, Peasants will do 25% more damage to Pikes, while Farmhands will do 25% more damage to cavalry. This, in accordance with their upgrades.
3. A final upgrade would allow the reduction of upgrade costs for Peasants by around 33-50%. Now, this might sound like a lot, and it probably is, but Peasants are pretty weak. They also lose a lot of utility and staying power in the late game.
The building will repair itself by percentages, meaning faster than the regular rebuild time (This is optional, it can be reverted if proven too strong in a whollistic perspective). This would be because the peasants living in the town hall would actively repair the damage as soon as possible. The Outpost can, through an active ability, sound a town horn by default that allows peasants in a massive radius to move at an increased speed by 20-25% to quicklier reach their targets while taking less damage from arrows by around 20-25%. This horn then goes on a decent cooldown.
Finally, the building is protected by a couple of spear throwers. Now it may sound like a lot, but once again, keep in mind that Rohan Peasants are okay at best. They could really use some extra buffs to aid alongside the Rohirrim. It will also assist in providing Rohan with some economy buffs alongside Corrupted Theoden's taxes.
They are mostly some conjectures and thoughts, so do not take them too seriously. Tell me what you think
Kind regards.