Ive looked for something like this for ages and all the plugins i have found are completely out of date and have stopped work on. Basically i think it would be cool to change [SERVER] or [CONSOLE] to a name you choose so when im in PuTTY monitoring my server i can type "say Hello world" and in game someone would see "[GOD] Hello world"
I looked there and only found this for the configuration console-say-format text <`r*Console`w> %s Format of the text for /say. %s is the text. You can use color codes here. Note that you may have to surround this in single quotation marks (') so that the program can properly read your configuration file. broadcast-format text `r[Broadcast] %s Format of the text for /broadcast. %s is the text. See console-say-format above. But I wasn't able to really understand what it was saying. unless in console say format the "%s" is what you want it to say instead of [CONSOLE] or [SERVER]