thank you for the feature suggestion.
Unfortunately, SSH tunneling isn't currently supported. We can check MYSQL drivers if they support it but I think there was some issue with that (maybe this wasn't available at all or there were some problems with that).
As an alternative, you can use Putty and SSH port tunneling, which allows you to connect to remote SSH systems and forward ports.
Regarding Navicat, what kind of support would you need? Do you mean import from Navicat format to Skipper?