Default vs. Local
This is causing misunderstandings - but mintInstall no longer changes your sources.list.
If my memory serves me right default is the applications default and local is your sources.list - which of course is your default
The wording is to be changed later on no later than with Felicia
Also, am I correct in assuming it is potentially dangerous to update the system using methods like 'apt-get dist-upgrade' or Synaptic?
You are very correct - as we use the Ubuntu repos this may cause problems
Note - as long as you only use the Ubuntu repos of the same generation Mint and Ubuntu it's OK (like Elyssa and Hardy)
But if you add Hardy repos to Daryna and dist-upgrade you get a mix of Mint and Ubuntu with somewhat uncertain outcome....