Modification of OSMC skin possible?

Is there any way to modify the OSMC skin a little, or even request a modification?

All I want to do is increase the opacity of the overlay in the skin so that the background Fanart is not so prominent. Currently I believe there are settings for low, medium, and high, but even at it’s highest setting it is not enough for my preference.

Have you selected a color for the overlay in the custom color section of our skin settings? There you can adjust the aplha channel or the opacity of the color you pick. That will also influence the opacity of the overlay.