a way to prevent from logging out ?

As to afk training @ rock crabs , is there a way to not logging out when your runescape is not in front of you ? Because sometimes i kill rock crabs to fast and i logout before 10-11mins :\

 

Use Nexus..

 

ermm where do you download it, nexus i mean

 

No, use rsbot, it's better, and free.
Rsbot.org
The website is down quite alot, so if you can't get on, don't worry.

 

Put something hevy on arrow keys ,
( Eg. A rigged dice , heavy side down )

 

Yup that works. or put an auto clicker on the up key on an onlinescreen keyboard.