Can You Override Built-in Global Shader Parameters with Shader.SetGlobalFloat?

Specifically I want to override the _Time shader parameter (to allow for pausing). I have many shaders which reference this parameter, and would like to override it rather than change them all.

When does Unity update the _Time shader parameter? Is there an opportunity to set it after, every frame, before the frame renders?

 

I don't think that's possible, but you could add ( on all the shaders...) a new variable like _CustomTime and mupltiply your _Time with it, and with that you could use SetGlobalFloat on the CustomTime.