I have to step up my python game then !!
Hahaha, mmh thanks 
For all the videos i’ve made, the complete animation is happening on one slider that goes from 0 to 1. Even the ones with plenty of clips happening one after the other : only one slider controlling the clips and managing the animation one after the others 
So that if I want to redo (after a year) a certain animation, I don’t have to dive in the spaghetti mess, I just animate one slider. But it’s also because it’s a better challenge for me haha
For the renders I use the Rendered Viewport with some custom materials. It’s a script from David Rutten that tweaks reflectivity and smoothness of the preview. I’ve seen Joseph Oster adding more option, but this is enough for me
Python wise I’m actually trying to make the Cycles render work with the animate slider function. I’ve seen some good code bits from (if I remember correctly) you and Anders Deleuran.
I just need to sit and dig a bit into documentations… If I manage to do something with it, I’ll make a post to document it !