[zermattgully]

I would like to see an option to only add email signature on New emails.

Don't see any point in adding to replies and forwards.... And would be the same as standard Outlook on Desktop.

[Elite1]

Welcome to CrackBerry!

Very good question actually. I've been lazy and still not set up my email signature on my Z10. I'll do so later and check it out for myself.

[Ecm]

The OP is correct. There's currently no option to make the signature show on new messages only.
Before BB10, I had no signature. I had different versions of signatures set up as auto text entries, and would just drop in whichever was applicable for the message. Unfortunately, until/unless the BB10 auto text is tweaked to allow line breaks in an entry, this just won't work. Hoping the next update adds this functionality.