First of all, there was no possibility that anyone could have seen Moon in NWFP on Saturday. Regardless of they could see the Moon or not, following Saudi Moon-sighting in Pakistan is Islamically inappropriate (even if Saudi have sighted Moon correctly, something they normally do not).
Actually, if the country is large and wide apart than to have several Eid in that country would be most appropriate Islamic act ... just like USA is big country and thus have several time zones within the country... and similarly there are different prayer times for different cities within a country where position of sun could be different even when country is small (and certainly in larger countries).
Actually, when we follow heavenly bodies (Sun or Moon) to determine hour of the day (from sun position) or Lunar months (from Moon position and sighting), we cannot have same time in the day at all places or same starting day for the month at every place... and thus it would be most appropriate that areas follow positions of these heavenly bodies to determine their starting Month and time. When heavenly bodies are made part of religion due to auspiciousness of particular days, months and prayer time (as in Islam ... where start of new month and determining of prayer times accurately is need of religion), this principle becomes more important... else we would be playing with people’s religion, making jokes of Allah’s command by making his command irrelevant, and thus causing many to end up in hell due to their ignorance in following wrong practices blindly against the command of Allah.
I won’t mind if all provinces of Pakistan become independent in celebrating EId, relying on moon-sighting locally, but certainly it would be a sad day for both Muslims and Islam if just for the sake of Unity, Muslims or even Pakistanis decide to change command of Allah and start relying on moon-sighting at faraway places to start Ramadhan and celebrate Eid.