Yessir, this is the solution I also came up with a month ago. The X SLOT TREBLE BOOSTER.
Tone is adjustable using the mod rate knob.
I use 60% mix, tone around 3.
If, like me, you've found the sound muddy (especially at lower volumes), this is the fix. Solves the "amp-not-in-the room" issue, imo.
Also, although it is true that the clean/dist input levels do not in themselves change the sound, they do affect everything downstream. Its more useful to think of them as a dynamics/EQ setting, rather than a way to balance levels. Setting them good and high brightens and punches up the tone. If you still need to balance clean/dist levels, I advise doing it in the stomps, even if you have to spend slot A just to control the rig input level.
Also, unless you are colorblind, I don't reccomend using the blue/red option for the level leds. The blue looks like it clips sooner than the standard red/green.