1. Already works. See shortcuts.
2. Drag and drop only applies to pkm/wc files, not encounter templates. You can still control & shift click between windows. Encounter templates have no byte[] data.
3. Showdown text does not accurately convey all details about a pkm. Keep in mind that the encounter database exists, and can easily search all encounters.
4. Separate program can generate {nothing}->gp1 data. PKHeX doesn't have a wondercard editor, as it is outside the purpose of the program.