Is it possible to record the bevel factor as a keyframe in the action editor? Just starting to get my head around animations in blender.

Rather than jumping straight into a rigged model, I smooshed together two things I had seen done in videos:


Using the action editor to make an action
Modifying the Bevel Factor on a bezier curve in order to grow a vine-like structure. (In my project it's a stylised trail from a spaceship.)


But, however much I change options around and use different methods of recording keyframes and swear, I can't get any keyframes recorded in the action editor, although they record fine in the dope sheet.

Is it possible to record the bevel factor as a keyframe in the action editor and I'm just doing something wrong?  Or are there limits to what can be recorded in an action?  How can I tell what those limits are?
it's because bevel depth is not an object property - it's curve data property. Action editor shows only one animation block (bordered with red line):



Outer animation blocks doesn't display in action editor

So what you can do - create a property in object data and make driver to manipulate bevel depth value in curve data 
through object data. 

Howto:


In object data find tab custom properties  and add one:





Next, open curve data side by side and press RMB on bevel depth:




Chose add driver -> single from target, and (when your cursor will be as dropper) click on value created before.


So now you have value in action editor, that manipulates bevel depth: