mm i still have to finish reading all the pages (actually i've processed the first 4:p), so maybe my contribute isn't so original or useful...
first point: good idea;)
second point: why make only "freespace forever"?
i propose to make something bigger, not only freespace related:
a project of an engine built specifically to support mods may have more success and you will found more help, even outside this community, in my opinion, than if it will be related mostly on freespace.
then, we may decide to make a freespace mod for this engine.
This will not mean that the engine will not be compatible with freespace2...
you already knows how the fs2 works, and fs2 is surely one of the most moddable games out there...this is something to work on....the new engine so may be build in a similar way of freespace2,
what i mean is that you can put as objective to improove the moddable capabilities... more possibilities in an easyer way than actually...even if it means to have less compatibility with freespace....this engine will be, so, the BEST support to any "artist" that is interested in space sims...
in an engine like that, the graphic capabilities will surely be important..but they will be secondary compared to other points..
talking about the "engine of my desires"...i'd like, compared to freespace, a better rendering engine (obviously), maybe that supports ani's as textures and layers, the possibility to make hyperspace jumps and play in different sectors in the same mission, a good support for "atmospheric" environment, maybe with the possibility to reach the surface of a planet from space, more dinamic missions with strategic possibilities (dinamic sets of missions, dinamic objectives and dinamic quality, type, number of your forces), more freedom in inserting movies, even in the middle of a mission, more parameters in the tables, and a better netcode:)
and, why not, a "space sim-on line"....