100% yes! SWTOR does this as well. It automatically takes the items from your inventory and/or bank when starting the synth.

Not too sure how it would be exploited--you can already craft in the field. Overall it's just a quality of life improvement for everyone. I definitely spend more time retainer dancing to get all my materials together than actually crafting. I'm surprised it's not already in the game seeing as how you can search for a material in your retainers through the crafting menu, so the data is accessible without having to "access" the retainer.