Add the option for emails to be sent as a summary (daily and weekly). This would be especially helpful for PMs to receive ONE email a day saying these people have submitted their time/expense today instead of receiving 50 separate emails that day. Some companies may even want the ability to have that summary sent on a weekly basis.
As far as fields, I guess the same fields that are in the current emails that are sent for each timesheet/expense report that is submitted.
How often - I envision this being in a set-up, with the option to receive a daily summary, weekly summary, or per-instance email (not a summary).
Trigger - Maybe this could also be in set-up, giving the options on when to send a summary... drop down with days of the week. drop down with time to receive email. The email would then be sent based on those selections.
What fields would need to included in the process summary report?
How often would this report be sent?
What would trigger sending this report?