"Does not hit, but Poisons enemies as though hitting them" and crits and other modifiers

How do "Does not hit, but Poisons enemies as though hitting them" effects on Gas Arrow and Poisonburst Arrow interact with critical hits? Can the fake hits crit and hence apply a stronger poison? Also are they supposed to interact with effects like the "Death from Afar" node, which increases damage from projectiles to enemies that are at least 6m away?

EDIT: the damage displayed in the interface for cloud and burst does go up when crit chance or crit damage modifier increase.

yes, I wonder too how it's calculated.
I noticed that added fire damage on my bow increases both the arrow dps and the cloud dps.
it shouldn't, or maybe the tooltip can't give a real dps number for thes kind of skills