As is now, it is possible to achieve that by selecting "ignore date" and uncheck the "unequal files" checkbox, but the "ignore size" is quicker and simpler.
Also, it would also be nice if you could "sync files in a direction". For instance if one chooses to "sync files to the right", that would mean that for all marked files:
- All files that exist only on the left side would be copied to the right
- All files that are different would be copied to the right (only if the left file is newer - this could be a question like the "overwrite" one that appears when copying a single file)
- All files that exist only at the right size would be deleted