I agree - CE means you can't run specialists, only Citizens.
All GP points generated by wonders are yours, as well as specialists provided by the GL and the AW.
You can't merge your GP nor Great Generals, but you don't have to kill them (hurts too bad

)
As for the SE, that means no cottages at all in your cities.
Otherwise we will quickly go into a sort of Hybrid Eco.
I would also gladly explore these issues, but maybe it's not the place here :
- Pure cultural victory with a CE - no GA farm, no bombing, no hammer/culture building, no slider (?)
- Space victory with pure SE - well, for this one we are well in the subject
