Wrong. L2Walker has had z-limiting for years.
Since I still play Retail (lawl t_t), I have to rely on L2Walker's OOG because it handles GG better than L2.NET if I recall. Also, L2Walker's autoattack setup is much more comprehensive than L2.NET's at the moment, but I hear they are working on that (collision, looting, etc).
Regardless, both programs have their uses. L2.NET is, hands down, much more capable in the scripting department (although L2W has made improvements to their scripting language recently), and it's a better program for private servers. I've made some pretty awesome scripts with it, but I'm stuck with L2Walker until L2.NET get a little more 'safe' on Retail--unless it already is and nobody told me!