A little obscure perhaps but when you want the obscure you post on BYOAC

I want to launch Need for Speed 2 SE in 3DFX mode on my cabinet. Can I launch nGlide without invoking the config panel? I just want to run with a default set of options. There's only nglide_config.exe so perhaps there is a command line switch?
I've finally got Screamer Rally working in 3DFX DOSBox on the cabinet. I'm getting about 15 FPS though. Where NFS2SE delivers at least 30 FPS. Is it just the DOSBox overhead or is there an overhead interfacing with nGlide?