Disable username in chat text window

How can I disable the inclusion of the username in front of each line of text in the Chat window? We really have no need for that, and it just clutters things.

There is no option to disable names (or usernames, if there is no name set in this user’s profile) showing in front of messages. You will have to customize Spark’s source and compile your own version. This could be as a feature request, but personally i don’t see reason for this as most people will need names.