[Q]

I believe almost everything that I could suggest has already been mentioned in this huge topic. But I would like to highlight three fields that are the most important for me:
1.) Modifiable. The possibilities to modify should be increased even more compared to SE IV (it was a huge improvement from SE III). Even abilities or possibilities that are not used in the standard Version might be very valuable for modders. Just an example: abilities working for facilities usually can't be used for components in SE IV.
2.) AI. I know many people here in this forum play mostly PBW and therefore the AI is not that important for them. However if you compare the number of SE IV copies sold (see topic about that) and the number of PBW players, you must conclude that the majory of the people who bought SE IV are playing solo games. Therefore any improvement of the AI will be an important sales advantage.
3.) Low hardware requirements. Again for computer freaks, who upgrade their computer every 3 months, this might be not very important. But I appreciated very much that I can play SE IV with a 5 year old machine!