You can set preferences to skip checking links, but it is all or nothing.
A script could turn off the link checking preference, listen for an open event, loop thru the links, skipping any link paths starting with imlink:, and getting the status of the others.
Use this code to turn it on or off:
app.linkingPreferences.checkLinksAtOpen = false;
Thanks! Is there a toggle for just checking image/graphics links and ignoring rest?
See Rob Day's comment, above.