Ability to save custom date ranges

[#1]

My company uses traditional calendar, whereas the company that just acquired us uses a custom 4-4-5 calendar. Currently, as a SiteCat admin I must choose either traditional or 4-4-5 calendar and this setting will apply to all users. Ideally, I would like to enable people to see either. If this could not be enabled easily, then a second solution would be to enable admin to build and save custom timeframes, similar to calculated metrics. Select time frame and give it a name - Parent company Q1 2011 or Parent company Month 10 2010, for example.