ANYONE KNOW OF A GOOD CUSTOM COLLISION SCRIPT

Wondering if anyone knows of a custom collision script. I'm using parallax maps and a more organic environment, like Legend of Mana

trying to make it so I dont have to use tiles to create a movement path


and use maybe smaller tiles, or be able to make my own map and import it to look something like this



I heard that someone is using such a script in http://rpgmaker.net/games/3082/images/38623/

If anyone has any info Id appreciate it. Thanks.