Advanced ActionBars for Bartender4
The advanced action bars give you full control of how your action bars are created. It'll allow you to create an arbitrary number of bars, which are not limited to the 10 bars with 12 buttons each that Bartender4 is limited to by itself.
You can choose to re-use the built-in action ids for your new bars (which allows saving their content on the game server), or create arbitrary new bars which store their contents locally in the addon. Or you can create extended macro buttons, which are not limited by the macro slots in the game, and have an extended length for the macro text (up to 1024 characters!)
More to come as this addon to Bartender4 is being developed!