You will not regret it. SPB does make the phone much faster and the best thing is that it will probably not suffer the lockup that Sense makes you experience. I've taken out Sense on my wife and my phone and we are very happy with our TP2.
now to answer your question.. Yes you can display more than 2 items. go to your calendar and click on the menu button on the bottom right corner; it will pop up the settings button. click on that and you can manipulate that however you want. Hope this helps.. Oh and if you ever get tired of the main screen look, check this out....
[UTIL] SPB Mobile Shell 3.5 [Tricks, Widgets, Themes, Other, FAQ, Config] - xda-developers