I would not say, that it is a cucial requirement ...
Hmmm. Well, my earlier post actually said "... that's a crucial requirement for an industrial-strength multiplayer game", while conceding that "EasyWebSockets could be of some use as a development platform".
Wikipedia has a useful article about the crucial role of the server in controlling multiplayer interactions.
But good on you, Ubivis, for taking up the challenge of developing a plugin! <img src="smileys/smiley20.gif" border="0" align="middle">