Make blend options switchable

[Imaginary]

When you make adjustments in the blend options of a layer it is sometimes difficult to assess the resulting effect. So it would really come in handy to have a possibility to switch blend options on and off in order to see the before and after.
Besides this every layer with adjusted blend options should have a cog icon showing next to the layer name. For layer effects it is already there.

[Imaginary]

Bump

[RichardMH]

Bump. Was thinking today I needed this. Or a way to copy blend options settings.