Wouter,
About the "simplification" of the Mainsail and Jib rule: If it were just a simplification, no problem. But it isn't..
Your proposal allows more sail area then with the current rules. The mainsail can be 15 m^2, whereas the old one had to be 14.85^2. (both with 8m luff length.)
The jib can be 3,7 ^m, whereas the old one had to be 3.65 ^m. (both with a 5.5m luff length.)
I am comparing your own examples on the F16 website.
You can't ignore these changes, almost all the current F16 sails would would be smaller than the new rule allows.
Besides, it would also change the rating; Both ISAF and TEXEL would rate the F16 1 point faster. I think we have already a hard time competing against the F18, this makes it even worse.
For me there is no real reason to change the current rule. You need a calculator anyway to know your "rated" sail area, or use the on-line calculater on the f16 website.
Geert