Organization Level Signature - Only creates signature via web client?

Organization Level Signature - Only creates signature via web client?

Hi there, I was really expecting the organization level signature to work at the send level, inserting a signature into outbound email so however an end user connects to their mailbox the signature was generated.
This is how Exclaimer works, it stops employees creating their own signatures and 'job titles' and keeps a consistent theme.  More importantly it means that a user doesn't need to setup outlook every time they get a new install beyond mailbox connection.
Is there a setting I have overlooked that allows organization level email signatures to be applied whatever the end user mail client?