So i just figured something out (kind of). In your my documents, there is a hidden runes of magic folder where your interface settings are saved. You can set up your hot bars for one class, back up this folder and name it, for example, Darwec_rwn. then set up for another class, make another copy, such as darwec_rs, and just switch between those interface folders and relog as needed. You have to have server save turned off for this. Also its a much less than optimal solution. Also i haven't slept all night, so if this doesnt make sense, please tell me and ill reexplain when im not sleep deprived.
I know what you mean however the hassle involved of having to exit the game entirely and do that swap is a little excessive, although if you have the patience to do that on top of backing up the folders for the eventual interface reset due to a glitch when it saved a lua file, it can work.
And yea, from the wording of their post about adding actionbars, it looks to be that they are going to add more slots.