I know this has been brought up already but I think it is a very important feature to have, especially for Kenney Studio NXT where its all objects.

Suggestions : That When leaving the template/object creator it saves your latest changes to the object and when you exit and return your actions are still there and you don't have to reconfigure all over again.

Yep I've already implemented this 50%. This way it works is that you can save the template configuration to a file, later on you'll always be able to open that file. The file can also be shared with others, and since it's just a long string of characters [the savefile] you could just paste the text here and others would be able to use that.