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@jemcapon: you can send HTML emails to users by using WP Better Emails free plugin ;)
Also, you can edit the text strings sent by searching them and editing the Jobroller's .mo/.po file with PoEdit.

Hello again. I'm really pissed up to get things working, so decided to trace the error, analyze the script and ... I found a fix, it's a typo from your developers, who forgot to use maybe_unserialize...

Guys, I just found a solution in one plugin:
http://wordpress.org/plugins/select-all-terms/

It adds exactly the needed buttons to select/deselect all the categories and it's thoroughly coded.
...