Are you saying that you want to be able to set a meeting to take place at
say 8:45 or 3:15 or something like that? If that is the case then it is
possible to do it already. All you have to do is open a meeting request and
select 8:30 and then highlight the 30 and type in 45 on the keyboard and
this will allow you to change the time to 8:45.
I hope this information is helpful.
Robert Findlay
Partner Technical Lead -- BizApps
Microsoft Technical Support for Platforms and Business Applications