Photoshop :: Changing Pattern Resolution?

This question revolves around the pattern stamp tool and masking out trees/shrubs. I use the patterns often because I am making 3d models of buildings from photographs. Often times there are many obstructions in the images that need to be edited out. So I usually create a texture pattern and then fill it where it needs to cover up these obstructions.

The problem I see is that there is no scaling on the pattern stamp tool. Each photo that I am editing will have a different resolution and so the original pattern stamp I created will only work on the original sampled image. There are several tricks I've come up with, such as creating a vector mask out of the selection and paint bucket filling the space with the pattern, then reducing the scale of the fill, but this method doesn't work all that well..

if there is a hidden trick to scaling the pattern stamp tool to work with?