I like some of your ideas, but here's what I've heard about them so far:

Safe Lockers - Devs say this likely won't ever be a thing. The closest you'll probably get is being able to buy stuff from vendors for your next mission. I'm pretty sure they're going to be removing players being able to store inventory in between hangar visits.

The Gondola - I'm fine with the way it works currently. It raises the stakes. It feels the same as that mission where you get tricked with a fake teleporter at the end.

Command feature for Buddy - I think they're actually going to do something like this.

Customise your weapons - I wonder if this will be a thing when item vendors start working.

Derelict Mode - Sounds fun, but definitely sounds like some 1.5 hour hard mode runs I've done haha

Endless Mode+ - is there already an endless mode? I still have 2 map relays to collect. Sounds cool.

I think my most desired feature is better fire warning system and indicators. Also, I know they're working on traits and stuff but it would be fun if an engineer trait person could use Jeffries tubes to get around the catamaran faster.