I added a new contact to PocoMail4 and filled out a template for use with that contact. I just tried using that template.

Firstly, if I have chosen a signature for a particular account to use, why would I want a template to automatically overwrite it? Wouldn't it make more sense to have a "Signature" field in the template and if that field is empty, don't overwrite, if it isn't empty, replace the signature?
Secondly, if I have indicated a template for a contact, why isn't it just automatically used when sending email to that contact, just like the email addr and other particulars of the contact? I believe that's what most people would expect when they see the Template tab in the New Contact dialog. I don't believe anyone, intuitively or otherwise, would expect that after specifying a template in a contact entry that they would then have to manually add that template and rewrite any other "canned" features of the New Mail overwritten by the template.
I know, you'll probably say, "The user can set up a custom Poco Script to do this...". I have 3 replies to that:
1) If the user can, then why not give an explicit example?
2) If the user can and you can give an explicit example, then why not just write it at PocoSystems and add it for this purpose?
3) If the user can and you have no intention of doing either 1) or 2), then why have the template feature in the New Contact dialog at all? You're only inviting users to be disappointed, upset, or dissatisfied, all of which are negative and aren't very good business moves!

I don't mind saying that a few years back, I was very happy with PocoMail/Barca because it had seen what the user wanted, beyond what other email clients were offering. But, frankly, I've seen it stagnate somewhat and it doesn't appear that new feature requests from users are being addressed to any high degree. Add to that, in the past, your support addressed problems directly and dispositioned them, letting the user know, first hand, what to expect. With the new "Help Desk", sadly, users tend to get very non-specific answers, or some such statement as, "unfortunately, PocoMail doesn't do that"!

[NB: BTW, we're in the second half of 2008 and your copyright statement at your website still says "Poco Systems Inc © 1999 - 2007..." ... I believe it's called "sink or swim"?]