Changing the file modification date has many severe and mostly unwanted side effects. It messes with your system backup, for instance. It may also confuse IMatch's 'file change' detection, among other things.
Settings the physical timestamp of a file from some EXIF data was sometimes required 10 years ago, when neither Windows nor other software was able to sort files by their EXIF timestamp. These days are long over. I strongly recommend that you review and update your workflow to current standards.
If you really, really need this, you can do it with ExifTool on the command line, or via the ExifTool Command Processor in IMatch. But I don't recommend this.