Those are good suggestions.
Just so everyone knows... even if I dont comment on suggestions, we consider them all. When it comes to deciding the feature-set and enhancements for the next version, we'll go through the entire suggestions forum and consider them all again, making decisions on how they fit into the UI and workflow of ArtRage.
Regarding the delay in switching layers on and off: That's a really really really tough one to solve. The final output of ArtRage is produced by combining all the layers, then applying the 3D lighting and texturing model. When you switch off a layer, we have to re-render the entire image again. Very slow. I could look at doing progressive enhancement updates in a later version. Or something.
AndyRage's mantra for graphics engine code:
"Sure - how hard can it be?"