It would be nice to have an option similar to
in the LMDE 7 Update Manager…
Is it possible to add it in?
Dontvthink so the update manager is a controlled process, yes you can add other links to other sites in it, but would NOT recommend doing so as the system is based on a working version and to get them out of step may cause problems. At one stage to update google chrome it was not in tge repository you could add, but I did not try it.