I bought your plugin today and was testing it's features, but I'm having problems with getting the object matrix to work.
By seeing Tiny Tank I guess you used the object matrix to do the skew on the tank parts. So I set a shear matrix and tried both the manual and auto update, but the object doesn't show any difference. Am I missing something?
I tried a lot of different values and searched for an action or property to maybe enable the feature but couldn't find anything.
You're correct, you should be able to use the matrix feature, all you have to do is set "Matrix Update Mode" to "Don't Auto Update" and then when you set the matrix manually you should see the result. I think you were mistakenly using "Update Object Matrix" after manually setting the matrix, which effectively wipes the custom settings you manually set with "set object matrix". "Update Object Matrix" is used to convert the objects current rotation/scale/position into the object matrix (these are actually different value than the matrix itself).
TL:DR
Turn off auto updating, set the matrix manually and you should see the results.