Add field to Migration Control to request specific number of days to be retrieved

Change # of days on demand for Migration Console

I would like to see the ability to change the number of days available for the Migration Console on an ad hoc basis.  In other words, without resetting the default number of days (which obviously affects everyone), add a field to the console where I can override "7" (or whatever the default value is) to be whatever I want at that point in time.  Perhaps today I want 10, tomorrow I want 14, etc.    

This would enable the user to be in control of the number of days that he sees without having to ask the Admin to change it for everyone.