Unless I am missing something, the only way to access the stored FX presets for a particular effect (eg Kemper Drive) is by scrolling down to the presets area and selecting from the named presets stored there.
Right Click on the FX module loaded in a slot only allows you to select alternative FX for that slot, not a different preset for that particular module. Bringing up a list of stored presets for that particular module (eg a list of saved presets for Kemper Drive when that effect module was selected) would be a great time saver.
Using the mod keys (Alt, Ctrl or Shift Click on PC) would mean you could access the relevant presets direct from the FX block in the editor. Something like double click or long click would facilitate doing this one handed. If I am in the editor, I am usually juggling a guitar or bass and I never entirely trust straps.