Also keep in mind this is your exact question as you phrased it to me (I only changed grammatical/capitalization issues) -- the first question (which you quoted) was my interpretation:

4) When Souken specified AddOns, he meant it as "in-game AddOns cannot perform this action" or he meant it as "third-party software or hardware of any kind cannot perform this action"?
Generally speaking, if we've disabled the ability for an Addon to do it, we don't want you to do it.

I believe that the rest of your questions follow the same guidelines.

Since Minimap:PingLocation only really WORKS on the minimap (it is a minimap function), I cant' really say whether Reythur intended that it apply to all in-game coordinates. Actually, I can't really find much value in that response other than my inference (yes, inference) of "If we say 'don't do this SPECIFIC minimap ping with an addon' then you also shouldn't do that same functionality using out-of-game methods". *shrug*

I'm still waiting to see if he'll respond to your questions.