So, first post ever.
I theorized over a potential cool skill usage:
getting about 120% quali for Vaal Blade Flurry. Just put something together in standard to test. I am at 103% now.
Character name "Rollkaefer"
So with that much quality the tooltip ingame says: "25% more damage with hits and ailments for each stage"
I combined Vaal Blade Flurry with conc effect and blood and sand for less AOE which then channels VBF for 20 stages for big ignite.
That would be 500% more dmg. PoB can't input them, but you could manually do it, or just multiply your PoB DPS by 6
Tested ingame on Act 6 boss, compared with WoC ignite.
WoC roughly did 3x the DPS of VBF, this corresponded with the non-altered PoB, so clearly the stage-multiplier did not work.
EDIT: Here are images of my findings, please consider, that I didn't try to minmax or anything, it's just comparing numbers of PoB (without the quality applied) with ingame (tested wether quality mattered)
Gem-tooltip while hovering (showing quality for vaal and non-vaal version)
Skill tooltip (showing the quality for non-vaal)
Skill tooltip (showing no quality for vaal version - first indication of a bug)
PoB current setup with no quali calculated (WoC had 28k ignite DPS):
Could very well be that this is intended and Vaal skills should not profit from quality, but didn't find anything on this.
Still the ingame gem shows the line as stated above...
Lemme know please.
Cheers