@tptquantum (View Post)
Those aren't good alternatives for @jjason02's suggestions, let me explain.
They wanted a tool that could launch particles in the direction defined by the mouse cursor. The launched particles are supposed to fly in a smooth curved path, which is not what you get when you use gravity, air pressure or force emitters.

I enabled both Blob View and Persistent View to makes things more clear. This is how the path the particles moved by gravity looks like: http://i.imgur.com/ylij5NH.gif
As you can see, the path DUST takes when affected by gravity doesn't look like a smooth curved path, the moment you stop applying gravity, the DUST particle falls down freely, as if nothing had happened to it before.

For air pressure, it's much worse, it doesn't look like a smooth curved path at all, even if it was possible, it would be extremely hard. Here is the path: http://i.imgur.com/O0M31bA.gif

For force emitters, it's very similar to the gravity one: http://i.imgur.com/96XCqbI.gif

What @jjason02 is looking for is something like this: http://i.imgur.com/kxm23oW.gif
The ball takes a smooth curved path, unlike the paths I mentioned above. I used Physion to demonstrate the idea because that's the closest thing I could think of to use. And no, the idea is not to implement movable solids that fly that way, I'm trying to say that the path each launched particle should look something like this.

So how could this be better than using pressure, gravity or FRAY to shoot particles around? well it would only affect the particles inside the brush area rather than all particles inside and near the brush, it would only launch particles in a single direction rather than having the particles on the right side of the brush fly in a different direction than the particles on the left side and most importantly, it would be much easier to control where particles fly and how fast rather than having to play around with brush sizes and locations to get the perfect launch. It's mainly for entertainment purposes and not something you would find useful when making saves.

@jjason02 (View Post)
Although I support your idea, I don't think it's possible to implement or worth the time, because let's face it, if it had been possible, simple enough to implement or worth the work, the devs would've implement them a long time ago. Either that, or they never thought of implementing it.

Also, it's always nice to make your game suggestions more detailed to avoid confusions just like the one that happened now.
Hopefully what I explained above is what you are looking for and I didn't waste my entire time making it just to find out that it's wrong.