State of customizations

[mototom]

I'm working on converting a 1e AP and wanted to catch up on where we were on customizations. Are there adjustments or tables to help with the following:

1. Grant a PC an ability to cast a spell (i.e., using a custom magic item activation, so something like adding as an innate spell with a number of uses specified)
2. Adding a custom ability—I know we have this ability on NPCs. Is there an adjustment or something that adds an ability where we can specify the number of actions, action type, etc., and a text block describing the ability?
3. Are we missing some spell adjustments? I couldn't find Nondetection.
4. Relatively generic notes, if nothing else. Situational notes are fine but have a few required fields and are overkill for just trying to describe a custom ability.