I wish VST Support too for my equalizer plug-in, but i think it's hard to do that.
VST plug-ins comes from OS9 and Win32/64 and many provided only as Win DLL, i think it is to complicated, to support it on all platforms.
But take a look to Terry West Productions CS12M 1.67 Equalizer, it was free-ware but now there is a Donut Button.
There are a lot of VST4Free sites, and you can find some CS12M 1.6x or CS12 Master freeware versions.
Try it with the VST-Bridge ()in Winamp, or MusicBee and you
can understand a little bit more, why some people doesn't like Built-in Equalizers and want to use there own VST-Plugin.
PS: Audacity support on my Windos VST-Plugins, if it support it on Linux too, then there is a code available if it is open.
Pustefix