Lots of valid build options coming off this. I'm going to be interested in seeing how this changes a lot of builds.
I'm really fond of healing scrolls with little or no failure without needing UMD on Skill strapped builds. The only issue is the 13 WIS or CHA required which won't fit into all builds. Pure Monk, Paladin, fleshy Sorcs and Wizards, a TR Ranger and many others can easily make use of this though.
The only Dilettante that I am not sure about is Monk's +5 WIS to AC. You are required 13 WIS to take it (I'm not sure if you can switch this feat or take it after character creation at any point) which means a +1 tome and a +6 item to be capped out. More than likely you'll have at least a +2 tome or a +3 tome and easily up to +9 in items. Yes, you could plan on not using these items but splashing 1 monk would serve you better for AC. Then again, to keep this balanced the monk splash needs some benefit... so maybe it's fine.
The ranger lores aren't very useful but I think the Bow Strength works very well for Arcane Archers who want to focus more on DEX and their casting stat than Strength. You should be able to start with a 10 STR and still hit the Bow STR cap fairly easily.
and:
"Half-Elf Follower of the Sovereign Host
Cost: 2
ML: 3
Requires: Paladin Dilettante
Grants proficiency with and +1 to-hit with longswords."
Does this count towards getting Whirling Steel Strike? (unlikely it'll matter because you'd need to be a monk with 10 CHA but I just wanted to check, it'd be cheaper and easier to just be human and take the proficiency feat.)
Additional Question:
Do things like this:
"
Half-Elf Armor Mastery I
Cost: 2
ML: 4
Requires: Fighter Dilettante
Increase max dex bonus on armor by 1
Half-Elf Armor Mastery II
Cost: 2
ML: 11
Requires: Fighter Dilettante
Increase max dex bonus on armor by 1"
Stack with stuff like this:
Daggertooth's Belt
I'm going to assume not. Seeing it's unlikely that a fighter taking Helf Fighter can get extra armor out of it.