Some of your suggestions are being implemented in mods (specifically 1,3&9)... It's just that they haven't been released yet, like TSB (Wolfy's Total Conversion) and Sdw's TC. Don't worry, they will come in time!
2. What else do you think we should be able to do? Learning in St. Kat's University is a start. Also, making each segment would require a different station UNID, but is totally doable.
3. TSB is beefing up St Kats IIRC.
4. A sidequest I can think of right now is being an ambassador to the Huari/Sung/Dwarg, but those haven't been implemented yet because of the amount of coding to be done (it's much easier to add weapons and playerships, which is why there are so much of them on Xelerus)
5.I'm thinking St Kats is being infiltrated based on the fact that some enemy stations hide out in the asteroids, although I don't know how stations could be established if both gates are flanked by CW ships...
6. A St. Kat's battle arena would be nice.
7. Maybe there's a secret dockscreen in one of the Arcologies? It would be a great mod to somehow access a BM
inside an arcology by using a secret code, similar to the one used to keep the Europa vault locked.
8. a Domina fortress does not fit the theme of the Sisters all that well.
9. Sdw is doing that for his TC.
10. All that has to be done is for someone to make a mod... Maybe giantcabbage's missionframework could be used here. Prophet started a thread on the Temporary Transcendence Forums about new BM missions, like assassination. I'll find the link to the theread when I get home.
*EDIT: Here's Prophet's BM thread:
BM Thread