I'm not sure if it's a worthwhile recommendation to have in the configuration file. The smb.conf parser is very quick. You'll only notice a slowdown if you have thousands of lines of data in there (e.g. people with a lot of shares or who set every parameter).
Would it perhaps be an idea to just mention the fact that creating a very large smb.conf file has performance implications and point out the existance of user shares? -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]