In the ingame overlay, I saw there are two button called next shader and previous shader, but they have no effect when I push them.
Is there a way to switch between shaders presets with those buttons? Like preparing a selection of shaders in advance and switching them directly in game? That would be awesome 
Yep, that’s how it’s supposed to work. It cycles through shaders in the top level of your shaders directory, though, which is probably why it doesn’t seem to work for you (there’s not much in that top level). You can either change your shader directory to a custom one that has all of your favorites or move copies of them into the main shader directory.
Thank you, it’s working perfectly! Very convenient!