Thank for the replies!
example 1: it would be nice to change snapshots in Audio Ease Altiverb and Speakerphone ( although I have some problems with the plugin window of Speakerphone in Qlab, but that's another issue).
I feel Altiverb works better on Cue Patch Outputs then on separate cues.
example 2: I'm now designing a show with a lot of pre recorded dialogues that all go into an Object map to position them on the same place as the actor they "correspond" to and at the same time I can wet/dry them in the object map using 3 fabfilter Saturn plugins on 3 extra cue outputs (3 extra amrks in the map). Left/Right axis determines position, up/down axis determines more or less fx in the corresponding speakers. Because I use this same map a lot, it is better for me to have 3 plugins on 3 cue outputs then 250 plugins on on cues itself. 
But now and then I feel I want to change the settings a little bit. For example 5 fade cues to 5 different settings would already be great.