InDesign Export to PDF Default marks type? Any other choices

I've perused the Adobe help online and can't find anywhere this is mentioned. In the dialog for Export... to pdf:

is there any way to add additional crop mark types? only 'Default' shows in the drop down.

I ask because I'd like to make the marks smaller. I prepare files for large format print at a 1/10 scale and the size of the default crop and bleed marks is adding too much to the final document size. I was hoping that this would be the place to adjust that size but I can't find where to add or edit the marks types in this drop down box.

Any suggestions are appreciated.