The medium badge isn't really that hard. When the laser pops up, keep your heli to the right and drop the guys one at a time, only when the laser isn't active. When the razors start moving, move the heli to the left until they're back on the left, then go back to the right to resume dropping guys one at a time. You only need to do this until you have 50.
Let's get some things straight here. The game as it is is not 'fantastic', but as I am a Java programmer myself, I have to congratulate Jagex, this is an outstanding performance programmed by an 'amateur' programmer. (Although you can hardly call them amateurs anymore)
This game is underrated. It's great.
There's one major problem: I often used the 0x ... = 0 trick, and when making large equations using that (& I mean LARGE) the game almost crashes. You should implement something in your calculations that checks where the zeros are first.
Second: IMPLEMENT THE KONG API!!!!!