We too would like to have custom fields in the WORKLOG. We use our worklog for generating invoice details to our clients. We want to have a Billable/Non-billable flag on each work log entry. Today the only thing we can do is have a shadow set of activity codes which are the same as our normal codes but non-billable. This complicates analysis.

  I note that in the OnTime database there is a WorkLogCustomFields table.