Any way to add this functionality to OS X?

Not that I've ever heard of.

 

I remember reading about a simple program that could do this. I don't remember it's name or even where I read about it. I do know that it didn't work with every app and liked to crash.

Also, it was written in Applescript.

 

Me either

Doesn't mean there isn't something for it, but I haven't seen or heard of it

 

BetterTouchTool has it, but it's not built into OSX.

 

Cinch seems like an adequate solution.

 

This is the app who's name I couldn't remember.

 

It's the best most useful tool for OSX.

 

I use Better Touch Tool and find the window resizing works very well. You can also get half screen windows dragging to left or right. Also great (and it's primary purpose) for adding gesture functionality to the trackpad and/or Magic Mouse.

And best of all, it's free!