Having the Auto Upgrade feature supporting more sources other than using a Mikrotik Router would be a big help. Having the ability to provide upgrades/downgrades through services such as FTP would allow one to make use of existing infrastructure or systems with far more disk space. (Barring running RouterOS on a X86 server). It would be a waste to run a Mikrotik based router specifically just for package sources.
FTP
SFTP
HTTP
HTTPS