Fairly simple exploit, really. I'm not sure if this is intended or not but it does work as of yesterday night - I did it with our successful downing of Omnitron on 10Man Normal.
Essentially, our healers weren't having mana problems but they adopted the mindset that any damage avoided is damage not having to be healed and GCDs not being used healing a DPS standing in fire. This "exploit" will involve two key rogue abilities - Feint and Cloak of Shadows.
If these are not on your action bars, please go and uninstall WoW.
The exploit is this: If you get targeted by Magmatron for "Acquiring Target" - and thus, the AoE cone, you can Cloak the Aquiring Target debuff, which will also prevent the cone from being used completely. Just make sure to cloak when Magmatron is still casting the debuff on you.
Also, not really an exploit but more a helpful tip: Both Incineration Protocol and the fire cone can be Feinted (that is, 50% aoe damage reduction) should the need arise.
I did search and found nothing of note. The auto-thread finder in the thread creation tool only linked something to do with Mana Forge.