I think Bartender lets you configure which way the vehicle bar's buttons flow (horizontal or vertical). You could join a battleground with a canon (Strand of the Ancients or Isle of Conquest) to test it out.
...being able to have my actual bar switch to vehicle abilities instead of having the huge ugly Blizzard vehicle art bar appear, the spell/macro direct binding plugin, ...
I've never had that problemnot even after the patch. For the direct binding, I was using the LibKeyBound-1.0 and LibKeyBoundExtra-1.0 combo (embedded into my UI as /kb), but the latter no longer works. I haven't looked into what it will take to fix it yet.
University and work has been very demanding the last few month, but at least University is over for good now (yay), and all i have to worry about is work .. however i still wanted to give you guys an update on the state and plans of Bartender.
The 4.4 branch
Work on the released 4.4 version has been slow, and i'm afraid it'll stay that way. It doesn't have any serious bugs, and if those come up, i'll of course fix them, but i don't plan to actually implement new features anymore.
What i do have planned for Bartender is a big new version currently planned to be 4.5. This version is planned to be released for Cataclysm, but once the UI changes for Cataclysm get out, and if it will be possible to easily make it compatible with the 3.x server, i might release it sooner.
The big plans are more dynamic action bar designs. That means, that you'll be able to layout your bars in any way you can imagine, not limited to the 10 bars with 12 buttons that we have now, but any number of bars with any number of buttons.
You'll have the choice to stay with the 120 button limit and use the server-side action buttons, or use an unlimited amount of new buttons that are saved on the client.
The configuration will be split in a "simple mode" which basically emulates most of the things Bartender does now, and an advanced mode that actually gives you access to the full spectrum of Bar layout.
I'm still drafting out specifics as i need them, but it is supposed to be the ultimate action bar addon, without adding a heavy burden on the users performance. This might sound like a conflicting goal, however, its really not that hard, you just have to properly turn off the features that are not used by the user, and all the features in the world wouldn't make it slower. ;)
The easiest solution is just to create more key-bindings. You do realize that you don't have to keep the default (1,2,3, ... -,=) bindings, correct? If you only want to use the first five number keys, you can still use Shift, Ctrl, and Alt to create more unique key combinations.
No, this is not possible with Bartender4's visibility conditionals. You would have to write your own addon to run a check OnUpdate for mouseovers on your desired frames and use SetAlpha to show/hide them.