You might want to check out TGC's newsletter in the following link
http://www.thegamecreators.com/data/newsletter/newsletter_issue_63.html
Scroll down a bit and you'll see an article FPSC v1.09 technology preview which has a screenshot and the following statement.
This screenshot reveals the upcoming foliage capabilities that will become available through update 1.09. It uses new assets from the TGC store, as explained in the article above. You can specify static geometry that has order independent one bit transparency and no collision data, which is ideal for grass and shrubs, and also for trees and bushes. The implementation of this feature has become available only after careful considerations of optimised assets.
I would install the v1.09 update and check this out. Using this new foliage feature will allow you to use static grass / bushes etc rather than dynamic which is required for the nocollision script and will give you much better performance.