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I can’t check right now, but there is a feature on the 3rd party midi, to increment or decrement scene level by 1dB and the save the preset. (Caution- if you’ve modified any states of blocks this too will be saved)
I believe there is something in the FC controls, probably under “utility”. But I think in this case it refers to “out1” not scene level.
I did this a lot with XL II plus and MFC-101. For the AXE FX III and FC pedals the function has been replaced by amp volume increment/decrement which you can assign to buttons on the FC. And it works really well, it knows what amp and channel your on at the moment and only adjusts and saves that one. When I used to do it with scenes I always went back later and set scene back to 0.0 and fixed it in the amp block. My default layout on the FC is scenes, I have a Volume + and Volume - always available. I don't even see scene level increment/decrement as an option in the midi menu any more.