1. Not as far as I know. You can however add an Environment Name and Color in System Configuration in 7.2 (previous releases might have it in the Application Server Settings file). Note you have to disconnect and reconnect to see the change applied.
2. Not as far as I know. Generally speaking, you can store the related settings in a Parameter and then reuse it everywhere, to have a single place where to change them; but I don't see any option to set colors for Hover/Highlight state on those components. You might want to log that in IdeaStream.
