I like to start off with a default project, so after loading Snap!, I load in my __default project (named like that to make it be at top of list)
And it has the things I want 99% of the time - the Alonso costume and the custom let block
But the problem is that I often forget, after making a project, to use File- Save as just do a File -Save and end up overwriting my default project and then I have a bit of sorting out to do
But I had an idea - had at look at the source code and had a guess that setting the projectName to null might prompt me for a file name - and it does
So, I've now added this block to my default sprite and all I have to do is click on it once when I load my default project in and then delete it.