Hi EI-CON,
A minor point but they taxi on #2 not #1, the reason being they often start this engine first to provide aircraft services (e.g. electrical power) in hotel mode.
As for an IFSD event being related to the time start time prior to take-off, I believe it's quite unlikely. The PW100 uses CF compressors so there's no much risk of having a rotor rub in the compressor and equally a turbine blade rub would result in a loss of turbine efficiency over time. Based on my own experiences, IFSD's a generally related to accessory probelms rather than core engine failures and accessory failures are generally not related to running time prior to takeoff.
Either way I'm sure Aer Arann tech services and PWC will check this one out.
All the best,
P2C