How can use the Lava Surge (Ele Shaman) proc if I'm multiboxing?

[BulletLatus]

you can place lavaburst on its own button and have ISboxer ( if you use it. you should be! ) spam it and your main dps key at the same time.. or make it a 2nd step.

I use PwnBoxer, so am I suppost to spam it alongside my main DPS key? Could you please take my macro and re-work it, because I don't know what you mean.