Possible FC upgrades

Please do not treat this post as an universal idea or suggestion.

This post holds various options of what may be a possible improvement for a Free Company.
So if you like 1 of these, press like on the main post and reply with the number of idea(s) you would like to see implemented in the game. Do not reply or like/upvote if you hate ALL these ideas.
And please do not reply to let us know you dislike one of them. No one likes toxicity :)

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(1) Add 1 vault tab for every rank in the FC (so if you have 8 ranks, you'd get 8 vault tabs) so you can keep them separated more easily for FC's with a lot of ranks.

(2) It would be useful if 1 vault tab had as much slots/space as a fully unfolded inventory (so 140 item slots per vault instead of 50).

(3) Allow us to "split up" the amount of slots in each vault tab so we can for example lock a part of that same vault to one rank, and reveal/unlock it for another as you would otherwise be able to do for the entire vault... but in this case treat those "split" vaults as separate vault tabs that may be shown at the same time if set that way.
Would be useful for FC's with more ranks or that wants to have an easier job sorting things out.

(4) Right now the FC can store gil which can be unlocked/locked to each rank separately. It might be useful to treat the vault as a bankvault so members can invest a certain amount of gil which they won't be able to touch for the remainder of that time.
When that time runs out they can withdraw that money with added % interest but a small fee will apply where a small amount of that profit is automatically donated to the FC vault (great to fund community event prizes or FC housing purposes). If a member has invested money in the vault but is kicked from that FC, they would still be able to withdraw that money through the Grand company vault (or it would be sent to them through mail).

(5) Several people love to be in a quiet community but there are also those that prefer to be in more active communities and in that case they'll appreciate bigger housing. However there's a shortage of large and medium housing due to the vast demand and obviously the fact that some people likely hold onto them to resell for higher prices. So I suggest adding the ability to "share" entire houses with 1-3 other FC's so the main plot owner still keeps power... but the other FC's can be allowed to make use of the NPC's, retainers, stables, foodbuffs). When they click on the vault they would see their own FC's vault inventory so FC's can't touch eachothers stuff. Sharing FC's may result in more people to talk with in the FC garden or house and therefor more people to play with that you may get to know a little better. Once you unshare an FC they will become unable to teleport to it or use its functions (same idea as a private house being shared).

I like every one of these ideas, honestly. But one that sticks out the most is 5. The ability to actually share an FC estate with other FCs would be extremely beneficial... especially since Airships and Subs are completely and entirely locked behind being an FC Owner or having the necessary rank within the FC to partake. Since the same door at an FC house takes you to private quarters and your workshop... allow each FC sharing the FC Estate to purchase their own Workshop. This would vastly cut down on the single person FCs that just want a workshop all to themselves by taking up a house all to themselves.