There's nothing wrong with allowing anyone to declare battle in order to accomodate with the different timezones within the syn.
I think currently certain timezone players are able to delete cc forum announcements (announcements of their actions ex. declaring war). Therefore I'd strongly suggest that Gree make such announcements to be non deletable so that we are able to weed out whoever declared wars w/o instructions.
+1 to Splintuh suggestion on having the ability to boot members who ain't performing during wartime.