For those that do not know, I am the maintainer for this plugin (my name at the top of this forum might be a give away ).
The plugin was not originally developed by me, but was written by Chardelle Busch. For the most part I have simply been tidying up the code and fixing any bugs that are reported. However, that is soon to change. I am writing just to let you know that there will be a new largish update for the certificate (expected by the end of the month) that will involve a complete re-write of the certificate type system (as there is a lot of redundant code that can be avoided) which will take an object oriented approach (much like the mod/assignment types). I will also be introducing more options in the certificate settings, and am currently in the process of deciding as to whether to simply add new columns to the existing certificate table, or create a new table with 3 columns (id, name of the setting, setting value) which will make it more scalable as there are numerous new settings to add (position of fonts, seals, borders, font sizes for each section etc etc).
To keep track of this update I suggest visiting github.com, creating an account (very simple) and then visiting https://github.com/markn86/moodle-mod_certificate and click on the watch icon. This will mean you can keep track of every code update, line by line, that takes place.
I will be posting more here closer to the release date. Such as how to create new certificate types for the new system. Please note, the certificate types included in the module (A4_embedded, A4_non_embedded, letter_embedded and letter_non_embedded) will automatically be converted, so if you have not created any new certificate types the upgrade process *should* appear seamingless.
[EDIT] I have decided to create a new module instead, rather than upgrading this one as it is impossible to know what code people have placed in their custom certificate types meaning I can not upgrade them without issues. The new module is in development and is located at https://github.com/markn86/moodle-mod_customcert
I will still be providing support for the old module and fixing bugs, but do not plan on adding any new improvements.