Is the 'all websites'a modifiable plugin to do this...?

The all data website part of PIWIK gives an excellent view of how each configured site is doing pageviews and visits.

Instead of displaying the current date, or greater time frame (as set at the top) I want it to display the data for the last 30 min.

a.) Is this a possible modification?
b.) Is this part of piwik directly tied to a plugin if so what is the name of it?