Apologies if this has already been suggested before, I only did a cursory check through the forum posts. 

I am currently trialing DeskScapes.  So far, it seems very good.  However, almost all of the backgrounds that other people make move too fast, and distract me too much. (Even the relatively slow ones!)

It would be really nice if you could add an effect to adjust the speed of a looped video, or of other types (dynamic and hybrid) as well if it's possible. The only .dreams I have seen so far with this functionality are the dynamic ones which came with the demo (the water and earth ones).

Anyway, I realise that it's probably not as simple as it sounds.