Two points.
Firstly, does the IMF have a magic potion that can be used on unions to stop industrial unrest? My guess is that if they came in here and fired public servants, the remainder would go on strike in sympathy. Ireland is not like some developing nations where you can send the army onto the streets to shoot/detain anyone who protests or goes on strike.
Secondly, at the risk of starting a constitutional law debate, Ireland is not like other countries where the organs of the state are above the citizens in the pecking order. We are unique in that absolute sovereignty is vested in the citizens, so the organs of the state are below the citizens. This means that, unlike most other countries, the state cannot restrict in law a citizens right to sue and claim compensation. It can also be forced to perform contracts it has with its citizens - unlike other places whereby they can just change the law. People on this thread have alluded to pensions etc. being cut, savings being taken etc.. In a lot of cases this could leave the government, and the IMF itself, open to legal actions that would make the army deafness claims look like small change.
Wouldnt it be ironic if the IMF was bankrupt by compensation claims? My guess is that the most the government can do is seek non-binding advice from the IMF. If I were the IMF there is no way I'd come to directly run Ireland due to the legal risks involved.