It just hit me that Skipped bars define the start of the frame! It is not at all necessary to set TF=Skipped bars after skipping bars - as one is conditioned by the manual.
You can set it to the number of bars(negative) back you really need the frame to span and that would only merge that number of bars! Urahh!

This explanation should be added to the manual!

One more question re bar() function:
- can you please give an example in the manual how Start and Time fields can be used?
- is it possible to add a return option that would "not start a bar"

Thank you.