That’s an idea we plan to tackle, since it would be awesome to evaluate Texmaps without having to build a whole bunch of support KCMs just to use a procedural texture coordinate.
Evaluating Max maps at different times is probably not easy or a good idea. I’d love to have the time derivative also, but the entire map tree needs to get updated when you want to evaluate at a different time so this would have to happen for every particle. I can think of several maps offhand that would cause my head to explode if I tried to do this.