I've been thinking about it some as well. I'd have to spend some time digesting the layers extension, but I was thinking it needed to behave differently than the other layers. I was thinking about the following:
- Phase 1
- Transparent, above the "top" layer, no grid.
- It wouldn't be selectable or editable directly.
- A few common effect icons would be available via the radial that could be placed on the layer.
- The radial would also include a "clear effects" selection.
- Phase 2
- Effect icons could be added to effects.
- When an effect was applied to a token, the effect icon would automatically be applied
- When an effect was cleared from a token, the effect icon would go away.
- When a token was removed (or made invisible), the effects would be hidden
I think this could get to the point that when an effect cleared in the CT it would automatically clear on the image as well.
Or am I massively over estimating what can be done with extensions?