HeHe, most of our flying is in the middle of the night ! Much of the turboprop night flying in the UK is non-airway so in practice you'd tend to get more direct routes anyway. STN straight up the east coast with Mil Radar was always a good way up to NCL rather than airway.
I use Jeppesen Flitestar for flight planning, and despite it being a professional system it still suffers from the algorithm problems of finding an automated route. I must confess as I look after the commercial side of our business I'm quite happy at the initial planning stages if a bit's added on for good measure so we don't get caught with fuel and engineering costs from an ATC re-route or hold which havn't been paid for
However you will find that RPLs often follow quite an "out-of-the-way" route as that's what the system demands, only to fly a more practical route every night (especially if you've come to an arrangement with local ATC).
Cheers
Jon