Thank you for your feedback!
Human fighters that only take feats are the exception to the rule, fortunately. Most characters won't take that many feats, and designing for the exception will always leave a lot of unused space for most characters IMHO.
I agree that a sheet with room for more documentation of your character/familiar/mount/cohort could be a useful addition. Unfortunately, I didn't design this sheet, I just added the form-fillable elements (and made some minor changes). So I don't have the original documents to simply make some more in the same style and thus would have to start from scratch. If you have a good lay-out in mind I would be willing to give it a go and brighten your lay-out with the style elements of this sheet (so with lay-out I just mean an example of how much room everything should take up, where it should go, what information should and shouldn't be part of it, etc.).
The things I think would be good supplements (just spit-balling):
- Stat block and stuff for 1 familiar/mount/cohort/animal companion
- Rewards section with description of (the functionality) of magic items and other rewards (boons/charms/blessings)
- Background story section (more room to expand on story and not just background traits/features)
- Spill over space for equipment
- Place to record level of fatigue (and what that level entails)
- Summary of what the different conditions entail
- Lots of space for notes (campaign journal/notes etc.)
Shame - one less feat space and a bit less class feature space on 2.01! I insist that my players pick feats but we have no single class fighters yet. Most of the pcs have 3-4 feats at level 13 so we will run out of space darn it!