1. Clock-face or as close to clock face as possible.
near clock face is pointless. It should be on the money, without little dithers, such as the 11:06pm Rosewood train ex Central, when trains normally come at :05 (Note, it's not so bad when it's in this direction. It's when the dither is 1-2mins earlier that it's a real problem)
Also, I'd like it consistent between weekends and weekdays.
Consistent express stopping patterns and short-working services are also a must.
Not too sure about this off peak. Definitely in the peak though. And peak Caboolture line services which stop at Albion, Woolloowin, Nundah and Toombul have to become express through those stations. I think off peak too, once Shorncliffe goes 15 minute frequency.