Hi Rauno,
The first point is not possible as a Crystal Report requires processing to be opened in a web server. It is not static. If you want to open a report without interacting with BI 4.1, you should save it as static: PDF or Excel.
However, you can achieve opening Crystal Reports in your Portal following the steps indicated in this guide:
BI4 Integration into the SAP Enterprise Portal 7.0.x
It is indicated in the guide, but to set up STS authentication, you can follow this guide as well:
http://wiki.scn.sap.com/wiki/x/3Is1DQ
Regards,
Julian