in reply to Altering "Server" HTTP Header Param
I think you'll have to tweak the apache source and recompile. The relevant file is src/main/http_main.c. Grep for 'server_version' and 'SERVER_BASEVERSION' to find the lines that deal with setting the server name.
The logic to create that value has gotten more complex since I looked at it ages ago, so it will take some work to figure out exactly how it gets set.