A couple of workarounds are here, which let you do this now:
-
Simple command which may be all you need:
ARCHIVE=.7z and ARCHIVE=single at the same time
(Jon's post; the first reply.) -
A script version which is more complex but may be useful if you want to add additional logic, or find the simple command doesn't work in some situations:
ZIP compression level ignored
(My post; the second reply.)
If using the script, change all (4) occurrences of .ZIP to .7Z or to .RAR as appropriate.