While that is a pretty neat idea, it's unfortunately more than a little outside the scope of the plugin as is.
As an extension, it has potential, maybe, but for paid extensions like that I'd have to look at how much work would go into it versus how many people would actually use it, and I'm not sure it's at a point where that's going to be feasible.
Firstly, it'd require a pretty substantial (optional) overhaul to how craft experience is stored, calculated, and handed out. As right now, experience and levels are stored in $gameParty, and with the change of crafting going to an individual, it'd need to be stored on those individuals.
Next, there's really no space currently in the scene to display who is doing the crafting as is. So at least one window would need to be modified slightly to at least contain a name, or maybe a face, or the currently selected actor.
Traits being passed on from the actor to only certain items, and only in certain crafting types is definitely a neat idea, but it'd also require a whole lot of new note tags. Maybe the additive traits tags could serve double purpose here too, but in general, having that many tags is a QC nightmare when it comes to actually testing.
Applying the results of those tags in itself probably wouldn't be too difficult, all things considered, as long as the scene already knew which actor was actually crafting, adding them to the item with a % chance would be pretty simple. The problem is getting to the point where these tags exist and can be added.
Plus, there'd be no good way to even see these actor-effects in game in the first place. One issue I have with the additive ingredients traits already is that there currently isn't a way for the player to see them or know they exist. For this to be intuitive at all, there'd need to be some way for the player to see those actor traits as well, requiring another window somewhere, likely not on the crafting scene itself as it's already pretty full.
Like I said, it's a decent idea, but I don't think it's something I'm going to be able to do here. Though my terms of use do allow someone (say you?) to pay someone else to make it for you, or even make it yourself and then sell it for profit too, as long as it still requires my plugin to function at all.
Thanks for your input, though.
~Ramza