Quote: "I use tabbing at the moment and only ever find it unpredictable when I import someone elses code"
That's precisely the problem.
Quote: "If I wanted to make it readable using space I'd wear my keyboard out using the current editor."
You must be doing something strange then.
Quote: "Yet again this is always down to personal preference. There's no right or wrong 'rule' except the one that works for you."
Agreed.
Quote: "I haven't updated Synergy Editor for almost a year, so you are recommended to use the new DBP editor anyway as it will have more recent fixes and enhancements."
That should clinch the issue.