I love Rotisserie. But if you are in multiple Roto leagues, there is sameness to it. The vast majority of leagues are 5x5 leagues with identical categories. As Yogi Berra would say, "it's like déjà vu all over again."
A little variety is good. I like OPS, a frequent addition in the 6x6 format. I like the hold, a common companion to OPS in the 6x6 format. I like having OBP and slugging percentage as separate categories even more than OPS. Next year, try this: drop batting average and use both OBP and slugging in a 6x6 format. Or better yet, try a really unorthodox format, 7x7, 10x6, or whatever. Use an OBS (Off-Beat Stats) -- it will spice things up. It's like getting the wife to put on a blonde wig.
If you participate in league with non-traditional categories, I salute you. It requires extra skill to manage the additional categories. You also have more trade-offs to ponder. For example, you have to consider specialists that might go unclaimed in more traditional formats.
Let's look at some of the OBS categories and let the 5x5 owners see what they're missing. All of the following players are available in the majority of traditional formats. The ones with value beyond their statistical specialty are for better. Those that are merely niche-fillers in esoteric OBS leagues are for worse.