we had large parties with the PCs and their minions; like the "Fighting Man" (Fighter) and his many followers (or men-at-arms). I have seen some adventures, including the official ones, add companions to the party but do not know the limitations of the Dungeon Maker in regards to them.

I think it might be cool to have an adventure where you can -- and should -- hire several (more than 2 at a time; and expendable) companions to fill-out the party to compensate for missing skills or just the need for more "meat shields" (to draw attacks, defend a bottleneck or protect the backline), firepower ("more DoTs! more DoTs!") or "red shirts" (to check for traps, ambushes or used as "monster bait"). The companions would be hirelings that would be rewards or cost money (possibly per day; $ / Long Rest) so it would not be required to keep alive but there is a limited supply; plus your reputation may affect the price.

Some Dungeon Maker questions:
* Can the party have more than 2 companions at a time?
* Do you create companions like PCs? Do they have PC-like levels and classes or configurable ability scores, hit points, abilities and hit points?
* Can you programmatically modify a numerical variable (like Reputation) that affects merchant prices or dialog based on PC actions or events?
* Do companions have to enter a (blue) transition area or do they automatically follow the PC they are "attached" to?

Not all companions have to be exclusively combatants. Some could be Experts (using a D&D 3e term) like a high-Stealth/Perception scout (Ranger), a trap/locksmith (Rogue), a low-level Magic User (Wizard) that can cast Detect Magic, Identify and other non-combat rituals, a even a cook (no need to haul rations around), herbalist, alchemist or scribe! (for crafting potions, poisons or scrolls while "on the road"). Those are just some ideas but the idea that party could be composed of PCs and companions, Experts or just more combatants, sounds intriguing to me.