I have upgrade to OS 6 on my BB 9300 (from the original installed OS 5). Is it possible to keep running OS 6, but JUST reinstall the Cod for the OS 5 or OS 4 BB Calendar?

I've been using OS 6 for several days now and love it compared to the former. However the Calendar views and functionality on OS 6 have been moderately disappointing to say the least. The visual and entry limitations when in the Day or Week views are really inconvenient because they don't show the full 8 hour range of a day in either of those views. In the full 8 hour day in the Week view as I did with OS 4 and (and I think OS 5). As well there are no quick entry points at the half hour marks when entering to make an appointment from the day or week view. Such a bummer as these made it fast and simple to see and set appointments when in a hurry.

Is it possible to reinstall just the BB Calendar from previous OS Versions, and keep running the rest of OS 6?

Much appreciated!