A couple of questions

[Lax]

Just remember: the cursor wont be translated into the spot shown by the video feed, repeater is still going to work like before just with the video feed showing

A Click Bar might be more appropriate than a repeater region, since you can tell it to do whatever you want when you click (e.g. fire off a spell in that window), and can do different combos. A repeater region would require something right there in the other window

The other question is if it's possible (and if it is, how) to make it so:

1) A step will only move to the following after a specific amount of time;

and/or

2) A step will only move to the following after the macro within it has done its full cycle (that can for example consist of a 4 spell cast sequence).

1. there's a checkbox at the top of each Step when setting up your Mapped Keys, which says Do not advance. That's what this is for

2. WoW does not provide or allow a method to receive feedback from a castsequence or cooldowns, so you will need to plan accordingly (when estimating for "Do not advance", for example)

[Altsoba]

Just remember: the cursor wont be translated into the spot shown by the video feed, repeater is still going to work like before just with the video feed showing

Thank you very much for all the answers Lax.
Regarding this one and as I told I'm asking because I'm not able to test it atm, what if/is it possible that the video feed zone is placed with a repeater region on top of it and matching the exact spot where the button is on the destination client? That's would have the exact same effect I'm looking for (to simulate like all "needed" buttons just "look" like they're on the main client window, and just click them and produce the correct, expected visual/game output).

Cheers,
A.