1. Understandable - personal preference
2. My original comment was regarding the stunning blow enhancements on the fighter - you need to have the stunning blow feat before you could invest AP in the enhancements. Guessing it is the same for dill.
Probably right there - rogue dill is the better bet for monks than cleric dill. Although if you do go Ninja-Spy you'll miss out on FoL and some self healing, which has some nice synergies with healing amp.
Not sure how useful this will be - after all, it doesn't count towards feat pre-reqs, is only one extra point, won't stack with existing class enhancements and only a few class/diletatante combos will see the full benefit. E.g. non-fighter melee classes with fighter dill could get +2 extra str (adapability + dill).