now this is gud if u cba click to drop items, though by using these hotkeys,u might find problems, like u wont be able to drop the last row, so u gnna need to drop last 4 items manually, but still mousekeys will do the most of the job for you
http://www.autohotkey.com/
after you have downloaded the program, run a setup etc then download this file
https://www.mediafire.com/?01ls19zm9dum156
instructions:
1. run this file
2. turn your numpad on by clicking on numlock
3. open ur rs, mine/fish/cut a full inventory of fish/logs/ores, and now move ur mouse to ores/logs/fish
4. now u might ask how does it work, like u can see on ur numpad there are arrows on 4, 8, 6 and 2 (sorry, the forum wont allow me to post 2 pics, dont have high rank for dat lol but i hope ya get what i mean)
and its basically the same as arrowkeys, 4 is left, 6 is right, 8 is up and 2 is down
once u have placed your mouse on ur ore or any other item, for example u have it on top of ur inventory, press 5 and 2 after it, and keep repeating it untill u reach the bottom, now you can move your mouse right by clicking 6, and now u can do the same thing(drop) by clicking 5 and 8 constantly
Numpad Keys(how they work while you have your mouse in inventory)
key 5 = rightclick + leftclick
key 4 = move left by 1 square in your inventory
key 6 = move right by 1 square in your inventory
key 8 = move up by 1 square in your inventory
key 2 = move down by 1 square in your inventory
and thats how u drop em quickly, it doesnt work really good with fish like: leaping trout/salmon because they are thin as fuck, but if you place your mouse correctly, it will work.
There ya go.
if i bother to, ill make a short vid/gif about me droppin em very quickly
alternative way: if you dont like the above guide(like u dont like downloading) then u can use this one which is kinda slower, because you need more things to understand
go to controlpanel and search "mousekeys", though imo it takes more to understand how things work, so if u wanna choose this path, then go on, but i prefer the first way more, cba makin guide about this way, soz.