Dear Geany developpers,
Sorry to not append this reply on the last mail of the thread, I was subscribed in digest mode until today. I will now be able to properly reply in-thread.
After your previous replies on this thread, I created a github account (and re-discovered I had one already:) so I had easily pushed a pull request directly on github. I think it will be easier for everyone to use this tool.
I personally only tested geanyprj plugin as a simple project manager. I don't know about gproject or others but I will have a look at them. The feature I like most in geanyprj is the ability to open and switch between projects by simply opening or showing a file of any project.