Several questions - Piwik reports

Hi,
I am using Piwik to generate reports to visiters groups refers.
Could you please help me to improve my way to use the tool :

[ul]
[li] Is it possible to customize the reports ?
[/li][li] Is it possible to reset the stats ? Automatically after a report ?
[/li][li] Is it possible to make some .xls extractions ?
[/li][/ul]

Thank you in advance,
Regards,

Guillermo.