when you want to add a calendar item, and then want to enter the time -- while you're not using stylus -- you need to scroll down of the exact hour and minute. And you have to do it twice!, for start time and end time.
it so not practical to scroll down and up. if you are in a hurry, you can mistakenly select the wrong time.
here are some fast tips to enter the time in calendar. press the number on your keyboard! :)
let say you have an apointment at 7.15 PM, you just pressed 1, 9, 5, that's it! fast and quick.
then press down on the D-pad for end time and enter the number of the hour you want to.