Thanks for contacting Red Gate.
I'm fairly sure that v7 has this option, but if you click the options tab when you create a new project, you can check the box for 'do not use transactions in synchronisation scripts'. This should stop you getting that error, however, something to bear in mind is that it wont roll back if the script fails so you need to make sure you're happy with it before you synchronise.
I hope this answers your question, if you're unsure whether or not you are eligible for more recent versions of the tool, give is a call and speak to the sales team, or you can email email@example.com
I hope this helps.