Hi. I think it could be useful to have the currently connected-to "instance" name (can't use server name since it's "not well defined" in a multi-server scenario) displayed between ISPConfig logo and "Logout". This way, who needs to have different panels open at the same time is less likely to issue the "right" command on the wrong site... An example could be a dual-cluster (production and developement) install: you don't want to publish your under-developement (and insecure) app on the production cluster, do you? BYtE, Diego.
its almost there why dont you use two different themes. i am using a grey theme for my "old" servers and a blue one for the new productive servers.
'cause I'd end up using a densimeter Think about handling 3 different "clusters" (apps: here each app often have its own dev chain and its own servers), each with "dev", "test" and "prod" partitions: already 9 colours to remember, and nearly no hint for the new admins. Themes could be useful to handle partitions (prod can be red-based, for "danger: think well before doing anything here!", test can be yellow-based and dev green-based), but an instance-specific message could be useful anyway (at least for daltonic or colour-blind admins).
a theme is not only for changing colors you can also enter ANY text you want at any position you want, so there is no problem adding a text "WARNING Productive-Server" wherever you want...