Login Splash page

[Connie]

there is no such plugin

but you can easily customize if you really want to do that, just run a google search for "splash page" + "php"

here for example:

http://css-tricks.com/redirecting-to-a-s...h-cookies/

but I really do not understand why you want to squeeze GS to be a backend interface

there are so many scripts out there, doing just this, check www.hotscripts.com for example ;=)