Hello Scott,

We've integrated OnTime with a report designer by DataDynamics called ActiveReports. 

There is some basic information on working with the Report Designer and scripting in our user's guide, which can be found here on our documentation page:
http://www.axosoft.com/support/default.aspx?cn=sup_docs

The best place for more detailed information is Data Dynamics' web site:
http://www.datadynamics.com/Products/ProductMenu.aspx?Product=ARNET2

One thing to keep in mind that may help, is that the scripting language is C#.  So for something like showing the current date in the footer you would do something like this:

• Create a text box in the page footer
• In the script view, select PageFooter in the Object dropdown, then select Format in the Event dropdown
• Type in the following line of code:
  ((TextBox)rpt.Sections["PageFooter"].Controls["TextBox"]).Text = System.DateTime.Now.ToString();
  

As far as formulas go, you can do certain summary functions on fields (look at the properties of a text box in the Summary section) when you use grouping.

Let us know if you have any further questions.