Until a new version appears where the routing of “CV” might be updated/improved, for 2.8, have you tried my two tools that are concerned with this mouse selection in the dropdown lists?
- MetaMicro (forum thread) - enables you to quickly set most *MetaDevice destinations with only keyboard (set keyboard shortcut in prefs first)
- Lord Of The Things (forum thread) - enables to set all 9 *Hydra destinations from GUI somewhat, like you say. Still in beta phase, as it’s currently possible only one time to select a destination effect by mouse and then you have to close and reopen the tool (also, remember to set the keyboard shortcut before use)