I was thinking of creating a small mod for personal use, but thought why not get some more ideas for it from other people? Basically, my mod has the following changes:

* Every ship can mount any turret/weapon/shield/missile and etc.

* No more leveling up, instead you have to buy "licenses" for ships. Example:
You start with a Light Fighter License, which enables you to buy LF's. If you want to buy a Heavy Fighter, you will have to buy a Heavy Fighter License. And so on and so forth. Each license costs different, maybe something like.
LF License: You start with it.
Freighter License: $100 000
HF License: $300 000
VHF License: $800 000

* Sometimes NPC's will offer you a whole map for a sector, which lists the commodities and weapons for each well known base. This is great since you don't have to land on each base of a sector to know the weapons and commodities. Although, hidden things like wrecks, and secret bases won't show. You will have to find those own your own.

* Two different versions of this mod will be available, open and storyline.

Well, thats all I have in mind so far. Any more ideas that you guys would like to see?