DesertDude

2. I'm looking for a way to pass parameters directly to a report (these parameters carry custom text to display in the report depending on choices made by users when requesting the report and have nothing to do with the parameter in question 1 that is needed for the sp).

Yes, We Can do like this also.. be ensure you have added starttime and  endtime parameters added in Report File . For adding  parameters in report

Menu Report--> Report Parameters.

 // To set the parameter values                               
                ReportParameterInfoCollection parms = ReportViewer1.LocalReport.GetParameters();                       
                foreach(ReportParameterInfo parm in parms)
                {                   
                    SetReportParameters(parm.Name);
                }  

private void SetReportParameters(String parameterName)
        {
            try
            {
               if(parameterName.ToLower() == "starttime")
                {
                    ReportParameter startTimeParameter = new ReportParameter(parameterName, txtStartDate.Text);                   
                    this.ReportViewer1.LocalReport.SetParameters(new ReportParameter[] { startTimeParameter });
                }
                else if(parameterName.ToLower() == "endtime")
                {
                    ReportParameter endTimeParameter = new ReportParameter(parameterName, txtEndDate.Text);
                    this.ReportViewer1.LocalReport.SetParameters(new ReportParameter[] { endTimeParameter });
                }               
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

In Report File you add this in filter by  Table Properties -- > Data -- > Filter options  Or we can display the starttime and endtime parameters in header sections.

For More detailed informations go thru this links

http://www.gotreportviewer.com/  

http://msdn.microsoft.com/en-us/library/aa337432.aspx