Are any details about Report Menu creations documented?

The first obvious question is, how does a report menu determine what from a current line (cell? item?) in a report is an input parameter for the drill-down report?

My custom reports don't typically have more input parameters than date-range and servers-in-scope (ie, based on View). Is there a way to take more input than that?

An example might help:

TSM Level	Total	Windows	Unix	Other
5.5.5.1	7	4	2	1
6.1.0.0	1836	1104	732	0
6.1.2.1	63	5	58	0
6.2.2.0	925	872	52	1
6.2.2.1	417	25	392	0
6.2.3.0	105	104	1	0

I'd like to be able to drill-down into "all the clients on '6.1.0.0' " or even "all the Unix clients on '6.1.0.0' ." I already have a report that does client level details as well as this "client level summary" report recreated above, but invoking it from a report menu with a right-click doesn't seem to be at all sensitive to the line of the report I clicked on; it just gives me everything.

Am I expecting too much? Or am I missing a way to pass parameters to the report being invoked.