if it is really only about the browsing i would suggest to use graphedit where you can conveniently scroll through all plugins in one directory with your mousewheel.
get it from here: http://www.videohelp.com/tools?tool=GraphEdit
build a graph using the DSFreeFrameWrapper filter. run that graph. rightclick dsfreeframewrapper->properties. press the browse button to select a directory with freeframe .dlls. click the pulldown to select a specific one or use your mousewheel to quickly browse through all.
if you don’t find your way through graphedit let us know.