Re: low temperature correction
With regard to take-off performance and correction of accel. heights. Assuming you are using named runway pages produced by a performance program you will probably find (obviously, check with your own performance people) that the figures have been inspected for the lowest temp. shown on the page (for us it's -20 OAT) and the accel. height shown will be valid for all temperatures shown.
If you are on your own with graphs and terrain charts etc etc. the it's one more thing to take into account.