Why thank you sir!
Hmmmm..... normally AT's dont shift or take longer to shift the harder you squeeze the gas pedal. this makes the car go faster for overtaking maneouvers etx. When i want to make mine shift up, i usually hold the accelerator steady at around 2k rpm. Or kung gusto mo you can actually shift from 2 and L hehe. just make sure you dont hit Reverse hehe.
Just take care of your A/T and it will take care of you. i change my ATF yearly, regardless of what people say. Hey, it's the only regularly maintained thing in your tranny, why skimp on it?

Also, of the Pajero tranny's ~8L capacity, only around 4L gets replaced.... unless you go through the laborious and expensive process of having the ATF sucked out. So 4L a year worth of ATF is reasonable. And at 1 total cost of around 1300 per year.... its a worthwhile expense imo. ;)