[whpalmer4]

In my opinion, you may be using the program in a fashion different than intended. Start and end dates should be used only when dictated by outside constraints. Otherwise, the start and end dates should be computed by OmniPlan. A new task added to the project should derive its start date from the dependency chains, constraints and resource availability, not by what date appears on the calendar the day you happened to put it on the plan. However, you could do your new tasks by typing them all in without setting any dates, selecting them all at once, bringing up the inspector and setting a start constraint of today (or tomorrow, more realistically). That way they won't be scheduled to start at the start of the project plan.

I still don't see how you expect anything useful to be done by a resource scheduling tool when you aren't willing to describe the resource needs....are you just using it as a glorified checklist?