1. Population functions like S&D. Troops are bought with gold from the population of a town, castle, or village.
2. They regen at a rate based on the prosperity of the town, castle, or village.
3. Their price is determined by the size of the population at the time of purchase; large population = much lower cost per troop while small population = much higher cost per troop.
Sort of the idea I'd prefer, but I think S and D function can be taken over by Population entirely. This gives villages, castles, and cities all different caps to AFK farm up to, and I think villages should probably generate troops faster. Or this could be something PP is spent on to specialize. Raise troop cap, raise population generation. Some villages are marketplaces others are recruitment centers, most a little of both.
The town could consume gold not just for its garrison upkeep, but require gold to fill population back up. Respectable amounts.
Also having players in fiefs should have more of a direct effect on things then where they AFK to spend their strat ticks. This is a real kicker. Lots of players jammed into a castle or town (the situation people are afraid of when it comes to long term sieges on shitty maps) could have significant penalties. The actual players themselves can start increasing the upkeep of garrison/population while slowing down troop generation of everybody.
Ideally things like this can be tweaked to increase the Kingdom Building element of Strategus with more strategic decisions while facilitating faster gameplay with less top tier equipment.
The game would be best with 5-10 times more troops being produced and half or less comparable gold once inflated for those troop levels. Entire armies should not be decked out in full plate but this is mostly a problem of gold production being so much faster then troop production that there's no reason to invest in full plate for everything.
These values need to be balanced so only a fraction of your army is in full plate, and only some of your horses are heavy cav. Another idea I had to address this is to make Upkeep be effected by equipment value of the army. Shiny army gets way more upkeep.
Basically I think the major problems with Strategus is
Too Much Gold, Not Enough Troops. Not enough battles that are too high risk, not enough troops for smaller factions to manage, too much gold so everything is a plate grind for the people with all the troops to begin with.
Our idea with Hero Party was to have smaller amounts of troops but invest in higher levels of gear to accommodate our better mercs, high gold income, but low troop production. Unsurprisingly other factions have many times more troops and they are all in full plate, even if they own less land.
These are all problems that could be fixed rather easily and make the game way better, imo.