Maybe it is just me, but this happens to me more often than not: I want to save a draft, but accidentally hit the submit button, which locks me out of further edits and I have to contact you to unlock it again.
As a way of self-protection I have installed the Stylus add-on in my browser and added the following style:
input.btn.btn-danger.save_submit
{
display: none !important;
}
For less technical people it may be nice to be able to put a tour into “draft state”, so that you can only save but never submit until you leave the draft state.