Why aren't we talking about this??

[Conqueror]

What would happen if your general dies of old age or is assassinated, leaving your army general-less? Would said army just sit still (when it might be in the middle of enemy territory) untill you can send a family member to fetch it?

[Philippus Flavius Homovallumus]

This would require recruitable generals, ones different from family members, probably leading normal heavy cav, or equivelant, elite units.

In short, while its a great idea RTW's engine probably can't handle it, not unless movement points are increased to the point where Generals actually move at a realistic speed.

[Ambiorix]

Maybe there could just be a way to reduce the movement points of captains by a huge amount, just not make them unable to move?

[Dayve]

Clearly the AI would not be able to understand this.

So the solution which i can't believe nobody has yet mentioned is as follows:

Captain led armies can move only in provinces that you own, but can never enter enemy/neutral territory without a family member.

[Foot]

The reason that General led armies are so involving compared to Captain led armies is because captains cannot be given traits but generals can. However, all that you have suggested, in discriminating between captains and generals requires traits, which we cannot do.

Foot