That is akin to me asking you to get in touch with the plugin developer saying "it would be a great update for them if they were to make the plugin work with Suffusion"!I'd suggest getting in touch with the theme developer first off, it would be a great update for them if they were to make the theme work with Jigoshop.
I have built support for specific plugins before - notably for "Now Reading", which is a plugin I personally use and BuddyPress (and a lot of associated plugins) which others use. The trouble is that a lot of plugins are built on a single case basis, assuming one sidebar and making them work with any other layout needs effort. E.g. What would happen if somebody were to extend Twenty Ten or Twenty Eleven to have 2 sidebars, one on the left and one on the right? That would break your plugin's layout right away.
Anyway, the solution to your question is provided by Jeff to your post on the forum: http://jigoshop.com/user-guide/theming-with-jigoshop/. In that link you will notice this:
That is your starting point, except that instead of "copying the files into a folder called jigoshop inside your theme folder", try "copying the files into a folder called jigoshop inside your child theme folder". Then look at the instructions above (pasted by Drake) regarding the template structure. That should take care of things.If you want to customise these templates you can do so (in an upgrade-safe manner) by copying the files into your theme folder, or copying the files into a folder called jigoshop inside your theme folder.
Alternatively you can try following the instructions on using template hooks (also in the article linked above) within Jigoshop.