[XBdroidMC]

Is it possible to have set rules for different plugins or hold to select which player I want to use?

Yes, see here:
http://wiki.xbmc.org/index.php?title=External_players

For example:

Code:

<rules action="prepend">
   <rule filetypes="mkv" filename=".*720p.*" player="MPC-HC"/>
</rules>

[/quote]

He might want to use the <rule internetstream="true" player=MPC-HC"/> rule since he asked about add-ons or he can specify by protocol to define the rule that applies to items whose (URI) protocol matches; as well as "real" protocols like rtmp, daap, rtv, rtsp XBMC also uses the URI protocol for things like zip, rar etc. Hope the info helps.