Sure! Stubbornness can fit other Dramatica terms too, Preconception especially, and lots of OS Character elements could be expressed through stubborness I'm sure. (stubbornly Opposing someone, staunchly Supporting someone, sticking to your Evaluations, Nonacceptance, etc.)
Plus, I think @MWollaeger put it best when he recently said:
I think we have to be open to characters acting like people. Not everything they do has to be dictated by the storyform. Nor should it be.
As far as the storyform goes, if you're feeling stuck and want to start some playground exercises, you could start them before knowing the PS Style and Driver, since those will only affect Signpost order and UA/CF/Catalyst/Inhibitor, as far as I know.
But we can definitely try to dig into Driver and PS Style more -- maybe you could start a new thread as this one is getting kind of long!
Tip About Action Driver
One thing about Action Driver, it's not so much "an action happens so then they have to deliberate carefully over a big decision", it's more like "an action happens and that action forces them to make a choice they wouldn't otherwise have made". Like in Star Wars we don't see Princess Leia deliberating much over whether to send the Death Star plans with the droids, but obviously she would not have done that if the Empire hadn't attacked. The action of the Empire's attack forced her to make that difficult choice, something which under normal circumstances she wouldn't have chosen.
I think there can be a little deliberation to show that the choice is difficult, but with Action Drivers you have to be careful not to have much or it risks making it feel more like a Decision driver. The particular decision/choice that is made has to be FORCED by the Action, not arrived upon through a Decision process. At least that's my take on it. (This was a misunderstanding of mine that Jim corrected me on -- I originally thought "Actions force Decisions" meant "Actions force long Decision Processes where they weigh their options carefully trying to decide which option to take". In my job, the word Decision usually means a Decision Request process, with a document analysing the pros and cons of each option, several meetings, etc.)