Current cost field is a per hour rate.  What would be better is for the period
in which the cost is valid for could be inputted e.g. 100 per day or 1000 per
week e.g. 25/h 100/d 1000/w  etc. Accrual should be pro-rata at this time and
there should be a flag to say if the value is for elapsed or worked.

The flag ideally should be against the Project as there is also the issue of how
lags are interpreted. Thus I envisage an "interpretation" table for how the time
units are interpreted for the Costs and Lags.

When a person puts in "Day" then this means either 1 calendar day or an "8 hour"
day. Quite a difference in meaning - 1 is a 24 hour period, the other is an 8
hour period.