I wanted something like this as well [1] -- as a work-around I made an alias "pluginaliases" that gives various options:
pluginaliases
1000>>>pluginaliases>->Open Plugins Folder | explorer.exe %FARRDIR%\Plugins>n>List Plugins | restartsearch aplugins>n>Reload Plugins | restartsearch goreload
I have a hotkey that brings up FARR and sets the text to "pluginaliases".
Admittedly, this may not help in locating the specific folder under which FARR is looking for Plugins...
[1] I'd also like an alias for bringing up the Plugin Manager dialog -- may be there is one and I just haven't found it
