The advice our CP received from P&W when doing the trend course was that even though 1000o starts can be well under the limit they do reduce the 'real' life of a number of components significantly.
Indicated T5 is air temperature not metal temperature. Whilst motoring the engine following a short shutdown will reduce the indicated T5 and gas temperature, the actual metal will not cool anywhere near as much during a 'short' motoring.
How valuable extended motoring is for cooling the engine to a 'nominal' T5 figure before introducing fuel to reduce start temps is a bit debatable IMHO - if a battery is already down the additional drain incurred may well result in slower acceleration during the later parts of the start and a hotter start than if the fuel was introduced earlier.
Our company policy is to pull the fuel if ITT reaches 600o before 25% Ng - if it is that high that early in the start there has to be a reason - and it is cheaper to pull the fuel earlier rather than too late.