Mining isn't as party friendly as before because you need to dedicate a character no throwaway alts really.
Bannering was always somewhat boring (can be fun but rarely is).
It would be nice to see an alternative to gaining authority to Steel and Linen. Something more 'village' oriented like mining previously was (not steel that was boring)
Static authority objects (Not expanding influence, simply gaining authority).
Something like Charterstone that stays in one place but this would add authority (Let's say 50k Auth) and worth a lot, takes one tile.
Could be used nicely for decoration or such?
Silk banners - Would be nice alternative for `looks` to regular banners. Show off how great you are (but also somewhat useful alternative

Paving would definitely be something that could be more multiple-people happy.