Pakistan is too much busy in its own problems, while situated far far away from Palestine. Whenever Pakistan got a chance, it had managed to help people in need, whether it's Afghanistan, Palestine and Bosnia.
Pakistan is the only country that has a record against Israeli Air Force. When others were only dreaming of inflicting a little damage, 3 pilots of Pakistan carried out 50 attacks over night in 12 hours on Tel Aviv, in which one of my father's friend lost a plane (not because of Israeli Air Force one-on-one engagement but he ran out of fuel and still managed to crash inside Lebanon).
Pakistan, using the right strategy, sent one superpower back home from its neighborhood, while other has also packed its bags. It's the strategy that wins, not weapons.
Supplying small weapons to Palestinians, who have courage but no military strategy training, is like asking them to commit suicide.
Don't bring Pakistan in everything while you know it is knee deep involved in other worst situations on both sides of the border.