Specify Export Paths for PDF's

When exporting layouts to PDF, our only options are to include a date. This means that when the layouts appear in a folder, the ordering of those files follows layout name, with no opportunity to choose any options in ordering.
pdf order.PNG
Please could we have some options. My preferred is to have a layout number (before the layout name)
pdf order_2.PNG

Ye, I expect we can provide some options for the naming of exported graphics in a future update.