I second this request.

There are a few technicalities that should be resolved when this is implemented.

First, if there are more players online then there are free slots in GNW, which players would be joined first? - Perhaps the ones with more power...

Second, what is preventing players that you "called" to auto-join to leave manually from GNW, leaving empty spaces? Should that option be disabled for those players? Also, if someone do exit from GNW would auto-join *on call them again, or it would choose someone else. One way to resolve which players would be called could be to implement another window with a list of all online players from group (that appears when "call" *on is clicked), and that there is a check *on for every player, so when you want to call them, only"checked" players would join.

One more thing, if someone is in a fight or in a ZENITH, doing instance, at home or something like that (when you cant call them to join team), could those player be interrupted by call, or it would be alloved for them to finish what they are doing now, and then auto-join after they are free again (although I think that would be bother to implement)? Maybe the best option here would be to be able to "call" only free players (except the ones in home bath perhaps).

This is a great idea, btw.