id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
111	josm shoud support system-wide plugin dir	ml@…	imi	"As far as I can see, josm looks only in ~/.josm/plugins for plugins, there's no way to have systemwide plugins.

I'm preparing a josm-package for gentoo and this would be a requirement. I'd suggest josm should look in some location in /usr/lib, e.g.
/usr/lib/josm/plugins
"	defect	closed	major		unspecified	latest	fixed