Use different padding for sides versus top (tabs) with 2015 Theme

[cuppm]

I'm switching from the 2005 theme to the 2015 theme, but would like to retain the same padding style that 2005 uses. That is to say I want the sides and bottom to be 0 pixels padding (right at the edge of the client space) and the top to have a few pixels of padding between the top of the tabs and the edge of the client space.

This is 2005 theme spacing:

The default 2013+ padding value for Theme.Measures.DockPadding is 6. If I set the padding to 0 so the sides are filled to the client space, the tabs look smooshed up on the toolstrip. This is what I get when I set the Theme.Measures.DockPadding = 1.

From playing with it, there's a property in the VS2013DockPaneStrip class called DocumentTabGapTop that will do what I'm wanting. But it appears to be a property that's only read from (with default value of 0) and is private without any way of programmatically changing it outside of setting the return value to be a constant.

Is there a recommended way of going about making this work the way I want?

[lextm]

You will have to develop your own theme based on the existing VS2005/2015 ones.