Last logins are usually thru tty or on the console. To check ftp logs and who's logged in, etc.. check your vsftpd.log or ftp.log, wherever it logs to. I'm sure you could hack the last command, it's binary so you'd have to grab the source, make changes and recompile or just write yourself a custom script to parse the logs for ftp logins, etc (which would probably be easier).
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