I have a dual monitor setup with two 22" screens side by side, so when I'm training agility I have RuneScape in full screen 800x600 on one screen (yeah, stretched) and a video playing on the other. As they are side by side it allows me to keep an eye on RuneScape through peripheral vision, while watching the video playing. I reduce my cursor movement speed so that I can more precisely click on the agility obstacles, for minimum annoyance.
Agility is really hard to endure, but this method worked alright for me from 71-73 (since the new graphics were released). Good luck.
