Me too. I came up with a sort of idea earlier in the year but it died on its feet at the time. I can't remember exactly what I suggested (its back on this thread somewhere) but it was something along the lines of you getting a single point if you better your relative position in a race compared to your last and lose a point if you're relative position is worse. The first race of the year could score a point for everyone or, alternatively, you'd compare it against the last race of 2013 but, either way, thereafter relative position (ie 30th out of 300 is an improvement over 11th out of a 100) would mostly either take one point away from you or add one point and many runners could be in a negative position.
So even a brilliant racer who has a nip and tuck year could end the year with perhaps no more than a single point whilst a gradually improving through the year mid or back of the pack runner could score 12 points (if one race a month was to count). Something along those lines could be (relatively) simple, great fun and, at the same time, give everyone a similar chance of doing well. Its also completely free from age and sex issues/excuses.