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The problem I see with this is that it would mean to add controls like
a slider to the menu, which is both hard to integrate with the look
and feel and the functionality Remote Buddy focuses on. So, for now, I
can really only point you to using the AJAX Remote in a browser. Be
sure to untick the checkbox in front of the Behaviour's name in
Preferences > Behaviours, though, as otherwise the Remote in the web
interface will control your browser and not the apps.
I might consider an onscreen remote at some point, but right now,
other areas require my full attention.
Best regards,
Felix