@olivierlambert
You're totally right about the workload, i was just throwing ideas (i personnalyy thought would be useful, and sometimes we dont realise we needed somthing until it is made). I didn't think about the need for the storage space 
My point was to find a way to make things easy for everyone and also decrease the workload on your side, if people can make their own templates and share them, then you won't have to do every single one of them, and we won't have to wait long before getting some template we need. Maybe at the very least the possibility for one to make his own template is a good start 
But what do you say about adding Fedora OS template ?