Things to do if you're just plain bored would be dress up items like some nicely carved wood grips for your trigger frame or a rifle like foregrip for in front of your reg.
A combination shoulder T stock and drop forward for my tank to get the balance into the right place while still letting me put my shoulder where I want it is on my list of rainy day stuff. I like to feel the whole setup balance in my hand or at least at the back of the frame where the web of my hand sits. But that requires the tank to be much too forward to let me shoulder it correctly without the back of the gun hitting my mask.
I just thought I'd take a quick peek and then the world went all yellow.....