Suggestions To Improve FCs

[NephthysVasudan]

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You can type a short post - and edit to bypass the char limit so you do not need to make multiple posts.

<Editing as my computer ate my post>

As to your suggestions:
FC weekly mission/challenges. Earn unique rewards.
This isn't something I see SE needing to implement - not a bad idea but you can do this with a little bit of effort on your own.

A FC exclusive instanced area, such as an arena or forest for challenges.
Same as above - organizing your FC to get parties going for regular duties is already possible. However unique challenges are not a bad idea.

More items available with FC credits.
Sure I guess - depends on the items.

High value investments with FC credits, risk credits on a Lost Thief's Treasure Map for example.
Not sure treasure maps are a good idea. Canals got nerfed from what I've observed (harder to get deeper) What high value investments?

An addition to FC housing - a sparring chamber. Could be a smaller copy of the one currently in Wolves Den Pier.
Could make a great gil sink - why not. But not useful as PVP actions are NOT the same as actual actions.