Breakdown Maintenance Order - Schedule date

Hi,

I have following requirement from my client to have

a.) Maintenance Order >> Schedule Dates should be in changeable mode and not linked with Basic Date.

     So that Basic Start and Basic Finish date can be used to track the Order creation dates and Schedule Start date and Sch Finish date can be used      to execute the work.

b.) Actual Start and Actual Finish date is also coming by default from system, while user requirement is to have Actual Start and Actual Finish      date also as manual entry fields.

I have checked in the

1. SPRO >> Scheduling >> Set Scheduling Parameters

2. SPRO >> Define Field Selection for Order Header Data (PM)  >> Field Selection for Order Header Data and Reference Object

But not able to do the required settings.  Kindly suggest how to fix this requirement.

Thanks

Mona