Here is a new video tutorial about group presets in Exposure. Complete presets such as Fuji Velvia 100F change every parameter to achieve the look. In contrast, group presets only change a handful of parameters at a time. For example, you can build a custom vignette and save just the vignette for future use, just like I do in the video.
The photo used was provided by Luc Coiffait. Thanks Luc!