Building reports via the URL can be really useful when you don't want to ensure a report exists or hasn't been modified, but documentation is pretty lacking on it.

Thankfully ralpho have seemed to figure out the url parameters.

Report type: List

Parameter	Value
manual_labor	true
form	list
query	encoded query
field_list	comma separated list of fields you want
type	list
table	table

A few things to note;

1. You can dot-walk on the fields regardless of role, so this is a great workaround to making some tricky reports for power users.
2. You can add variables from sc_req_item if you can figure out the sys_id of variable

Here's an example report url I generated for someone the other day that included variables;

sys_report_template.do?sysparm_field_list=variables.71cba0540f5fb600503c590be1050ec0&sysparm_type=list&sysparm_table=sc_req_item&sysparm_from_list=true&sysparm_chart_size=large&sysparm_manual_labor=true&sysparm_query=cat_item%3Dc9d980750f437200503c590be1050e8a%5Ecat_item%3Dc9d980750f437200503c590be1050e8a