Reporting Services Advanced Features

I am looking to find more information regarding advanced filtering/report parameters available in SQL Server 2005 Reporting Services. From what I can see, the user can set values for each report parameter and the query defaults to "where x = (param 1) and y = (param 2)" etc. Is there a way that a user can pick parameters that structure a more complex where clause? For example, say I want to filter by all clients enrolled in all of these 3 service programs and have a dog or clients not enrolled in one of the following 3 care programs or clients who live in one of the following cities? So it would be like this:

where (((sp = 1 and sp = 2 and sp = 3) and animal = dog) or ((cp not in (1, 2, 3)) or city in (a, b, c, d)))


In addition, I am looking for more information regarding programmatic capabilities in Reporting Services. Can anyone point me to a good place for this information? I would like to know whether we could structure part of a query in VB.NET code and then pass this query to Reporting Services to join with the basic report query. Also, I would like to know Reporting Services' capability to interact with stored procedures.

In addition, is Reporting Services more for internal business reporting, or do companies add it onto their existing software package to sell to external customers? Does Reporting Services allow one report to be created, and then users (our customers) on different servers who use different databases to run the report by giving Reporting Services their credentials (database, SQL Server login, etc)?

Basically, I have just been following the tutorials on Microsoft's site, but they are all pretty basic so I haven't gotten a good feel for whether this product is good for advanced reporting needs.

Thanks!