When I tried to use DiscussionTools with {{subst:Please see}}, it signed for me twice. Could this be fixed? It also didn't provide an edit summary because the header is included in the template; resolving that would be good as well.
Topic on Talk:Talk pages project
Ah, my question exactly, I also use some templates like this which contain a signature inside - and this gadget signs them again.
I looked and couldn't find the 'don't sign this post' checkbox, which would be a simple workaround (since having the tool figure out which tempaltes should not be signed might be impossible?).
This is not currently possible. There is no way for the software to know what the template contains.
I wonder if it would make sense to standardize all templates on the same/non-signing behavior.
"not currently possible"? I really have to doubt that—surely it's possible for the reply tool to detect four tildes? (Doesn't it already do that if you try to sign manually at the end?) This is an issue that absolutely has to be solved before this tool can go out of beta. Regarding standardization, the nice thing for {{Please see}} is that it's subst-only, so we could change its behavior if we wanted without messing up the past instances. But that's not true for all templates that have this problem.
When you type {{subst:Please see}} into the box, there are no tildes. The Reply tool can detect tildes in its box. It cannot detect tildes that are added after the message leaves its box.
You might be interested in reading about the pre-save transforms system.
The work around I can think of is a checkbox (turned on by default) with 'sign this post' (or alternatively a checkbox not to sign). I.e. a one click way to make sure we don't leave double sig, if making the soft detect double sigs in templates is too hard for now.