A little list of features that I would like to offer.
1) Make it possible to @killcount several different mobs.
At the moment it's only possible to count kills of one specific monster. Sometimes it's not very cool, because, for example, you hunt rare items from different mobs on one map, or you switch farming places.
2) Make @whosells display the name of the shop.
Currently it only shows the coordinates and the nickname of the merchant, which is super inconvenient. I usually go to the place where approximately merchant is and start scanning nicknames of all vendors in the area with a mouse >_>
3) Add a feature that prevents unwanted selling of rare equipment to NPC.
I think most RO players have experienced selling their +10 Ghost Cotton Shirts to NPC along with loot. It would be nice if there appeared some kind of warning when you are trying to sell rare\carded\slotted\refined items to NPC. At some point it can be annoying -- for example, if you are selling tons of Stilettos after grinding Desert Wolves. So I think there should be either a smart system that distinguishes really expensive stuff, or give the player ability to turn off this feature completely or for some exact items.
4) Add something like "@antilootid" command.
Sometimes you kill monsters and you want all loot from them except specific items. For example, Falchions from Pasanas , Axes from Minorous. It would be really nice if there was an option to disable autolooting them.
Hope you find my ideas helpful :D
Thanks for attention!