Exactly this. Designers or potential designers, should stop looking at engine feature lists like they are the last stop on the train of looking for a platform to push out their idea.
Treat your idea with respect first, and dont try to shoehorn it into something.
Or, as was also pointed out, you have the FULL SOURCE. You can augment the engine to be what you need it to be.
Time and Effort.
Cheers.