Is the third paragraph of the scourger dedication intended to be a separate benefit, or apply only to the ability to craft temporary items? As written it is unclear. If it is the former, it is a very powerful (if very situational) dedication. If it is the latter, the dedication becomes useful only in a very particular style of campaign (similar to eschew material components).
If it is a separate benefit that applies to all crafting checks, how would you adjucate providing the cost of crafting materials? EG, If a scrounger was willing to take a -10 penalty to craft a 20 gp item, could they gather 10gp worth of anything to pay the initial cost over the first 4 days?
This could be a big benefit to "recycle" the plethora of +1 striking weapons a mid level party will acquire fr their foes without losing the 50% selling them to buy new components.
There is NOTHING about Crafting taking less time or costing less: i JUST allows you to use whatever materials are at hand. This means you can make a broadsword out of twigs, twine and rocks or a staff out of iron bars: this can be interesting as you could make items out of special materials that you normally couldn't, like Darkwood platemail. You can't take a magic item and use it to reduce the price though.