Town Watch, useless or not?

[Shieldmaiden]

Peasants are better value as garrison

I'd love to find out if its possible to mod RTW and buff reducing unrest if a particular type of unit is garrisoned. I.e - a Town Watch unit reducing double the normal amount of unrest.

Pipe dream? If we can't give a unit something a bonus what can we change, other than anims and model and combat stats, etc?