one won't get information on this so one can't circumvent it easily.
The system checks your heroes overall actions in the last few minutes, depending on some criteria like being in combat and being in the base it determines if you meet the criteria to be considered AFK.
The I don't know the exact requirements to be marked AFK and I doubt any S2 staff will be will to give them as if people knew that then you would use the information to avoid the AFK system.
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you'll not be marked afk for hiding in the woods and leeching xp.
you were afk-kicked while getting xp from lanecreeps? are you sure it was not a normal kick?
if you are sure, provide a match id pls.
I know for a fact that staying within the boundries of your base MOVING, it will have a longer timer and the option to kick will come into the play.
I know this as I was once in a game a whole back, three of our raxes were down and I was the one defending. Running around like a sodding loony to distract the creeps. I then got a warning saying if I didn't leave the base I would be marked AFK and kicked.
It's log, it's log. It's big, it's heavy, it's wood!