Yes, it can extract a specific value
Because I want to be able to import a character and automatically be able to save some of the base values, such as gloss, and then when my scene gets the character wet (boosting the gloss?). And then when I wet the character in the scene (to increase the gloss?), it can dry itself out and revert to the default skin condition.
but don't need it to be stored continuously and automatically, which I can do using like LogicBricks maybe
How would a plugin do that?
You would need to handle every SINGLE storable inside VAM, and give a UI to define the default values, create a save of that and commands to restore them.
You are litterally asking for a plugin that "duplicates" the preset system behavior.
You are trying to imagine a plugin that would do "magic" out of arbitrary needs you have (for instance the gloss example you're giving). This is not possible as... it's not gonna make your life easier, it will simply shift the same concept as the presets in another plugin.
What I do in my scenes, is use VAMStoryDirector for that. Director has dozens of triggers handling states. For instance "All characters at default position", "Character A wet", "Character A not wet"... etc... Then for direct state change, Director handles the calls, and for any animated states, timeline does (getting wet through animated values).
A plugin cannot save time and scripting "magically", especially if you're doing very advanced changes during scene playthrough. You will need to do it yourself, and handle resets/changes yourself.
One note tho: VAM workflow is not ideal. We have play and edit modes, yet, the modifications of storables are "permanent" no matter the mode. I would love that VAM behaved like Unity where Play Mode makes temporary changes and when you get out of it, everything resets to its default state.
Sadly, this behavior means YOU have to do the work. This is annoying yes, but no plugin is gonna change that fact.