All i have to say is thank you for not giving up on past games.
First I would be thrilled to see the functionality of AP, implemented in TC and if possible even in Reunion (i m mostly interested in combat so, boarding/capturing everything that flies).
I remember reading that there are ships in TCs data files that are not available in game.
Having all those features in previous games would make them worth playing again and again.
Also, if possible to run the older x games (x-tension, x-b, x2) with the graphic engine of x3 or later.
Something like the Elder Scrolls Morrowind, being run from inside Oblivion or Skyrim and thus with the current graphics engine. (its a community project
http://tesrenewal.com/ )
I havent played anything before reunion and although i tried, the graphics just ruin it for me. So i would LOVE to play the story before x3 and not just read it.
Apart from the above, any mod that improves already existing features of the game should be imo, implemented.
The work is done and ready in the mod section and there is no greater reward for a modder than to acknowledge his work and make it a part of the game itself.
Also consider sending mass mail to all registered users because what you are aiming to do, is big for the X universe.
Many ppl have stopped playing / visiting these forums after rebirth and might miss this so important post.
This could actually re-ignite the X flame.