Okay guys, here's the specific hack to set the defaults to 'full size' and 'no link'. Slight variations will probably get you the other combinations.
WARNING-1: Hacking with the files inside wordpress is a very bad idea. I avoid it at all costs, and so should you.
WARNING-2: I'm no JS pro, not even close. This hack was made through trial and error but seems to work for me and I can't think of a reason why it would break anything. It basically just changes the default which was hardcoded into the JS anyway.
WARNING-3: If you ever upgrade wordpress you'll have to do this to the new file, so keep a note about it for reference.
In your wordpress install:
At line 103 it says:
checked = 'display-thumb';
change it to (change 'thumb' to 'full'):
checked = 'display-full';
At line 118 it says:
h += "<label for='link-none'><input type='radio' name='link' id='link-none' value='none' /> " + this.none + "</label>";
change it to (add checked='checked' inside the <label>):
h += "<label for='link-none'><input type='radio' name='link' id='link-none' value='none' checked='checked' /> " + this.none + "</label>";
Then enjoy your newly useful uploader!