G15 (no macros used) ok?

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I use it for formations as well which do include a pause here or there.

I specifically used a press-duration key for formations so absolutely nothing is automated. The longer I hold the key, the further the groups spread. I'm not willing to risk having a pause in a formation key being seen by Blizzard as automation.

What do you mean by this?

If you mean you are using the "repeat while held down" option in the G15 macro option then this is considered automation by blizzard. If you mean you use your formations through keybinding the regular movement keys that would auto-repeat under regular WoW useage then you're fine.

No, I'm referring to an AutoHotKey method. I don't use the G15 for anything other than keypresses and the G-keys to substitute for Alt+Shift+Ctrl+(1-9).
Awhile ago, there was a discussion about how to make formations using AutoHotKey, and one of the original threads mentioned having a key (F1 is my formation key) bound so that 1 keypress will send a signal to all WoW instances to "KeyDown, hold for 4 seconds, then KeyUp." The action bound to F1 on the alts depends on which direction you want that alt to move. Alt 1, move forward. Alt 2, move left, etc. However, this is a form of automation since it uses a delay, even though it's minor. I didn't want to take that risk, so my F1 key will now send a KeyDown action to all WoW instances, but not send a KeyUp action until I release the key. This method has no delay, and that's how I want it to work anyway. I like being able to choose my formation spread distance by how long I hold it down, and it uses no automation.