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The Fastchip/RS Tuner remap will help with the cold idle, but if you have a especially rough idle you might want to look at other things.
It could be a sign of bad injectors, dodgy ignition system or sensor faults like the coolant temp sensor or primary lambda.
RS tuning did mine. It gained 10bhp but it massively smoothed out the power and made it more linear and smoother. It also feels a tad quicker through the middle to top end and noticeably increased torque low down. Very noticeable. It'll also raise and smooth out the idle and factor in any exhausts system changes and induction changes too. Very worth getting a proper map imo.