new users shell set to /bin/false - are there any security issues?

[kev <kbailey@freewayprojects.com>]

i'm using a pretty much standard debian stable machine.......


i need to allow users FTP only access - i can create them with

#adduser --shell /bin/false <username>

in the /etc/proftpd.conf file i can set
RequireValidShell off

so that the proftpd server allows the users access even though they don't 
have a valid shell.

but i'd like to know if there are any security considerations i should be 
aware of with having a shell of /bin/false. 

thanks,

kev