I'm trying to set up suEXEC and have inputted the user and group in External Scripts of my virtual hosts, but PHP still says the file is being run by the server user, which causes the script to be unable to write to the document root.
Sorry if this is confusing. I believe these may be holdovers from Enterprise settings. I'm not quite sure what they do on OpenLiteSpeed. For setting up suEXEC, though, you need to set the VHost Security > ExtApp Set UID Mode setting. This should enable suEXEC for this vhost.