Rated 5 out of 5 stars

Thanks for making Thunderbird as flexible as KMail ;)

What doesn't work for me:
1. Choosing "Start my reply below the quote" in account settings places
the SmartTemplate4 text at the end of the message.
2. Choosing "Start my reply above the quote" leaves 2 lines of space
between the SmartTemplate4 text and the quoted message.

I'd gladly give a 5 star review if those things would work (either I'm
doing something wrong or it's due to bugs).

Much thanks.

This review is for a previous version of the add-on (0.9.1). 

Thanks for the four stars; indeed we have a new development team and we are fixing (and tracking) a lot of bugs on bugzilla:

http://smarttemplate4.mozdev.org/bugs.html

1. this is [Bug 25099], you can find a fixed version here (0.9.2 prerelease 42):
https://www.mozdev.org/bugs/show_bug.cgi?id=25099

2. This is [Bug 25103], with the prerelease from above you can set it but we haven't written a global settings page yet.

https://www.mozdev.org/bugs/show_bug.cgi?id=25103

There is a new setting in about:config
extensions.smartTemplate4.insertBRatTop

which is currently boolean (true / false). We might change this to be a numeral instead so you can choose to insert 0,1,2 or more <BR> at the top. Default is false and this completely removes all line breaks on the top.