Happy you like it!
Option for customizing Container-Colors and -Names should be no problem, gonna implement that together with the Preferences-Feature for the Add-on.
If I understand you correctly regarding the Hotkey, you mean a Hotkey that opens a "New Window" without a Container. If that's the case, then yes, support for opening Tabs/Windows without a Container is also planned.
Edit (27. Nov 2017):
Preferences for configuring of Container-NamePrefix, -Color and -Icon is now available. Default NamePrefix changed to "tmp".
For now the only way to have "No Container"-Tabs is to deactivate the "Automatic Mode" in the Preferences.
Edit (2. Dec 2017):
There are now Keyboard Shortcuts to open "No Container" Tabs even in "Automatic Mode": Alt+N (New Tab) and Shift+Alt+C (New Window)