There is some ideas from small to huge.
Small:
Ability to store / load a weapons skill set;
Separate clothing from jewelry in the inventory/bank;
Possibility to sort armor by type (head / body / etc.) and weight (light / medium / heavy);
Sort weapons by type;
Medium:
Increase PvP damage for 10%, maybe also 5-10% of the gathered resources of faction members in faction-owned territories. The benefits would be for owners faction members compared to other factions and that would stimulate farming in areas owned by factions with PvP on, defend teritories from opositing fraction farmers…
Huge political:
Let’s call him an “ambassador.”
This idea will improve the quality and diversity of interactions between factions as well as within the faction itself.
Faction members elect an Ambassador for two weeks. Every other week each company nominates one candidate and the election begins on Friday and ends on Sunday. Ambassadors authority starts on Monday morning.
The ambassador receives salary 1% from faction owned towns taxes.
The Ambassador may change the global tax rate for each of the opposing factions + 0-50% once a day. For example, if the tax set by the city owners is 10%, the ambassador can change it from + 0% (the same 10%) up to + 50% (which would be increased to 15%).
In order for the Ambassador to be able to influence the companies of the faction represented, daily events should be introduced. For example, daily faction excavations, daily quests and / or other events where the Ambassador may deny access for certain companies. These possibilities can be realized with the next point.
It would be interesting to introduce one big event.
Every weekend there is a war between all the factions. The ambassador chooses one or more companies to take part in the war from his faction. Participants in the war receive payment for their participation in the war. It could be like an outpost rush or something like that. The winning faction will have the opportunity to use exclusively (except companies for whitch Ambasador denied access):
teritory with increased resource gathering, luck etc., enemies with exclusive drop, etc .;
daily excavation;
daily quests;
the list can go on …