More flexibility for procedural displace modifier textures

Displacement modifier: You can use procedural textures, but as far as i know, you can't combine them or drive one by another like you can do for materials. That's a pitty since there is so much more what one can do with procedurals...

Example for procedural displacement (notice how poor the craters look because i couldn't edit the texture like i wanted to): facebook.com/GrinsegoldArtGallery/photos/a.1794570647255684.1073741829.176933982352700/1795639083815507/