The "Lava God" powers you speak of are at the VetOP+ level, and greater ones are at the Controller+ and HC+ level. DarthLego is right, we have this for a reason. While changing the lava can be fun and exciting, it greatly taxes our server. Certain combinations can lag the hell out of the server, making other players mad, making the higher staff mad, and making our service provider mad. The reason that controlling the lava is at a high level, is because it's expected that those staff members know what they're doing, and won't abuse it to the point where things go bad.
Don't get me wrong, I've played many a game where I tried to mix things up and make it fun, but ended poorly because I chose a wrong combination of effects, but being a Controller, I also have tools to fix it.
A suggestion I have to you would be to simply ask a VetOp+ very kindly if they could change the speed or the mood, and don't beg or torment them about it. They may or may not heed your request, but if they do, we have much more confidence in them wielding the powers than a player.