I'm pro on champion splitting as well. Spinny basically said it all. I concur.
Score = Time weighting: SADX, SH, SA2B, Rush and Shadow (pending cuz of Spinny's comment).
Score < Time weightings: S1, S2, S3, S&K, STT, S1(GG), S2(GG), KC, SCD, SC, SPA, S3DB, SAdv, SAdv2, SAdv3.
Games unaffected: SB, SJ, SD, SD2.
That's just my list of the weightings, all based on my opinion. Are Rings really going to get weight? Would it be less than Score/Time or equal?