I remapped mine from triggering Siri to simply be play/pause. I'm happy with it but I agree I'd like options. It would be nice to be able to trigger Siri once in a while or skip songs or modify volume.
Yeah. Volume doesn't bother me too much, but I'd love a next track thing. I kind of wish I could setup different things for the left and right AirPod. At least then I could have pause on one and Siri on the other (for most other tasks).