Osbo - don't worry the 'clutching at straws' reference was not intended to be personal.
If you go onto the Q400 Perf section, ignore the destination charts and go for the link ALL OTHER AIRFIELDS you will find all the non optimum charts for many airfields we operate. It has proved handy to keep a copy of these charts in the back pocket (another metaphor?) so the Dash can get it up - so to speak.
Btw my sole intention with my post was to correct the false impression of the Dash, in that it is overtly limited. It appears not at SOU using the figures I have available to me.