+1
You should be alerted if a player is afk whe you use /seen and /msg.
The way that the afk plugin checks if you are afk also needs to be changed. Right now, I believe that the server does random checks every so often and if you are standing still, even if only for a second, you are set as afk. This should be changed to a timer that starts if you are standing still. If the timer reaches, say, 5mins, then you are set as afk.