BA Stairs

This is my first serious look at the Stair tool in BA. I am using it in a UK/European environment.I have had a look at us ncs dataset because I expect that is more feature complete but I am now using the 08.11.05.54 UK Uniclass as my base point with the intention of tweaking our customised in house dataset once I have learnt how it fits together

I have a choice to model the stairs in a conventional way - there a 4 stair cases two of which go up 7 storeys with differing storey height and two that are between two floors, which will 

I am working on the basis that to set out and model the stairs would probablytake me 1-2 days and as such I should spend this time working out how the tool works so I can use it within our system - do people think this is realistic?

I am looking to get a better understanding of the configuration and control of the tool. So some questions:

1. The documentation looks a bit incomplete. There is a lot to take in here and some complex and powerful controls which I am discovering by trial and error which is tough.
2. I am making a steel stair, which I have been advised that the stringers should be 300x20mm flats. There are no flats in any of the libraries. How do I create a stair of this type?
3. I am struggling to get continuous sectioned stringers (using 200x100 RHS) at the moment because the mitring geometry around the inside of a U-shaped square looks like it is a little deficient and it appears that the controls to adjust the run-in and run-out at landings aren't there at least at a key-in dimensional level. For any stair with stringers I think this is structurally preferable but from an Architectural perspective it is aesthetically very important. It looks to me that the tool should be able to embody these a characteristics with in it. This would be really useful as its one of those difficult geometry exercises that you need to plot out very time. You could add a resolve mitring toggle - that would give you a minimum landing depth.