i have a quadro fx 4600 and...so many time ago i tried to instal the web driver. The result was that in the 3d softwares like "Modo" i had artifacts..so , if i well remember, i had to delete the pkg from Library/Receipts. Then i discovered the quadro fx 4600 wasn't in the list of nvidia supported video cards, infact the fx 4600 was never released for mac and the cuda core never worked on osx for me ( i have cuda 5.5.25 and today i had a new crash trying to render a scene with "indigo render" ( a plugin for C4d that works with cuda and openCL technology) . So, i never tried to add the kernel flag in org.plist , but i'm afraid it dosen't help me. :/