Doing math in workflows
It would be helpful if in your workflows you could do math. For example we have a workflow that creates a new deal in the renewal pipeline for every contract that is invoiced. For most of the contracts simply adding a due date of 365 days (1 year contract length) is good enough. However, some of our customers have a 3-5 year length which we have defined in a custom "Contract Length". Ideally you would be able to have a workflow that could do something like $Close_Date + $Contract Length = $Due_Date.
I could see other uses for this as well, but this is the immediate one that comes to mind.