There is indeed a way to do that. It's just a bit annoying when you are not using tobo atm.
There was a nice proggy to change the names of your items, a.k.a. quality viewer.
*EDIT* Hehe, no reply and the first part already found. I'm just too proficient in using the search button :nice:
One of the values there had to be changed, after that it'll ask you wether to drop the item or not. Do that with your ginseng and arrows and I'm sure COpartner won't drop them anymore. Yet im unsure about tobo. (never used it to drop items :err: )
(link to this topic will probably follow as well. I can't find it that fast. Guess my search-button-skills are still too low. I'll try again tomorrow and lvl my skills

<-- manual lol. there is none. ._. Let's just hope other people will come up with the link

)