using external memory as storage

I know there are quite a few methods to do this, some of them work well some of them don't.
I have the problem that my phone is full of games and I just have a little bit of internal space left (under 1GB) BUT a 64GB microSD with MUCH space left.

So I wanted to ask if it's possible to safely "remount" specific folders like /sdcard/Android/data and /sdcard/Android/OBB to /mnt/extsdcard.
I know there is an app to do this but it doesn't seem to work for all games.

also, I know about this script: http://forum.xda-developers.com/show....php?t=1772234

this actually worked well but is there a easier method to apply a patch like this?
like a gui app or something where I can switch what memory should be used for /sdcard ?

thanks in advance.