wParallax OSL missing EXR load button

Trying to load OSL script from wParallax in Blender
Everything works well, except one really frustrating thing… Its not possible to click and load EXR map, have to type the file path manually. This is very tedious if you have many planes, and you have to manually type the paths.

Is it possible to add a load button for EXR map?

There is an example blender file in the free scene:


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