Does libertarian freedom entail the ability to do good or evil?
Some folks attempt to hold on to libertarian freedom even in light of an inability to do good or an inability to do evil on the basis that when faced with a choice between good and evil, there are multiple options for doing good and multiple options for doing evil. So let's say Jesus has libertarian freedom, but he is incapable of doing evil. One would say that when faced with a choice between good and evil, there are multiple good options that Jesus could choose from, and his final choice is not determined. If he chooses one good option, he could've chosen the other.
I don't think this is an adequate escape for libertarians, though. I think it's a slight of hand. Let's say George is faced with a choice between drinking Sprite or Dr. Pepper. You might be tempted to think this is a choice between two options. But in reality, it's two distinct choices with two distinct sets of options. One choice is whether to drink Dr. Pepper or not. The other is whether to drink Sprite or not. That's two different choices, each with it's own set of options.
When Jesus is faced with some temptation, his choice is whether to give into that temptation or whether to resist that temptation. If resisting that temptation leaves him with multiple options, those multiple options are part of a distinct choice. If Jesus had libertarian freedom regarding the choice whether to give in to the temptation or resist the temptation, then he would be capable of doing either. So if he is incapable of taking one of those options, then he does not have libertarian freedom regarding that choice. If, having resisted the temptation, he is left with multiple morally praiseworthy options, his choice between those options can be free in the libertarian sense, but that doesn't make his choice on whether to give in to or resist the temptation free in the libertarian sense.