It'd be a PITA to keep track of, and I think that generally, if you have a good enough system for part of adveffects, you have a good enough system for all of adveffects. The actual memory added on by each feature is relatively small, and the 'minimal requirements' pretty low. I have:
AMD64 3000+
1024 MB DDR400 RAM
GF6600 GT 128MB
SATA Hard drive
Audigy 2 NX.
This is basically the minimum requirements for games like Battlefield 2, and still gives crappy load times in HL2 with stuff set to high (even though gameplay is usually smooth), but can use adveffects with antialiasing on most missions and still have them be playable.
The biggest problems usually show up with the HT&L Aeolus, IIRC, although nothing in adveffects should effect that.
So...considering the number of people who got/are getting systems better than me for Christmas, overall it's easier for people to just individually extract the features they want.
Edit: Oh, and sorry about the #End thing. I'm too used to having a parser to check my syntax.