Marissa-
That is a great idea, unfortunately right now there is no way for any UI to tell the classes of group members, so that can't be done.
Aaldolin-
I just posted an optional bank window download on
http://www.lodidodi.net that uses a more typical placement of the shared slots. The
graphics page on that site has a screenshot of both versions. It sounds like you, Hedein, and anyone else that doesn't typically share plat between characters would prefer the optional version.
Lodi Dodi