Phaeden,
On the Surfaces Tab in WrpEdit, at the top, there are, as you probably know, 2 checkboxes, Flags and Preview.
The Preview checkbox only becomes active once a certain level of zoom has been reached, then you can preniew the textures.
However, you already know this.
The Flags checkbox gives you a greyscale representation of the textures instead of the colours you get if neither checkbox is selected.
It is possible to switch the greyscale representation off for ANY particular texture.
If you select a texture from the texture list then right click it in the list, you will get a menu thus;
Add
Refresh
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Colored
Not Colored
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Remove unused
Remove duplicates
If the texture is represented by a greyscale, selecting 'Not colored' will switch this off.
Colored will of course reverse this and switch it on again.
You can, for instance, have all textures but one invisible using this method.
So you can see the texture you are working on at the moment.
I know this is the case for the original textures, but you will need to try it with any custom textures you are using.
I'm not sure how many levels of greyscale are supported, but I would be pessimistic and say 16.
Hope this is what you were after.
Planck