Stickers across multiple parts (STAMPs)

[Orion Pobursky]

I think we have a good enough rule already.
Origin of a formed sticker should match the intended place where it is supposed to be placed.
In the Santa Fe, it's the flat front, but with rounded corners, of the locomotive. No STAMP shoutcut needed.
In the Funnel in question here, the origin of the intended brick. No STAMP needed.

That make sense for the sticker in isolation. However, we've already decided to allow sticker shortcuts. I think allowing a shortcut where the sticker extends past the part used is a reasonable change for these cases.

Also, and I'm not sure if there is a set where this happens, what about the case of a non-formed sticker extending across multiple parts in a non-horizontal/vertical plane (e.g. the flat slope part of multiple bricks)?