Yea, i scrolled up a bit and realized it's been asked a lot of times. Also, i think i have made kind of a mistake, i intepreted "Pickup Items" (in pk3ds) as overworld items you can pick up, but judging by the layout it's about the ability "Pickup", thus not changing anything about the Overworld items. And then going by what i read, Overworld item manip would change something with scrips, which isn't really doable, so i assume it's impossible at this time to randomize the items you pick up in the overworld with pk3ds?
And sorry for not looking all that up before replying, would've been a better move.