All features in Budgie are designed to work with both mouse and touchpads, with extra effort on consistency with actions being with left rather than right clicks. Right-click menus are fairly common, so they are typically seen as a global exception, but the only places we use that have an alternative primary action, e.g. IconTasklist, or on the desktop (which is a right-click menu to access Settings and the "background").
Having "gestures" that require mouse movement and a mouse click simultaneously aside from the usual drag-and-drop metaphor is neither discoverable nor user friendly, so you shouldn't really ever expect functionality to be included that'd require it.
This feature isn't "very specific", it's incredibly niche to the point that it wouldn't justifiably be included in Budgie. Budgie is intended to be a modern desktop environment that is in a middleground of personalization and functionality between that of GNOME Shell and Plasma (not too little customization, not too much that it is overwhelming and negatively impacts development iteration and overall usability).
Either way, don't really want this discussion getting off-topic, since the original discussion was a Raven API.
