deck beams query

I am sorry to pester with a new thread, but afraid the question would get lost in the mail)
In delft, is it possible to enter factors into beam height, like .5393 at 2/3 beam and so on, or does one have to enter control points to get the curve of beam?
In my hand loft days I would use factors .8818 and .5393 on each and every beam,
As it is by adding edge and moving to C/L the (beams end up as oblique triangles( so??

 

You'd have to model it by using controlpoints

 

so, did you see my post in fave software?
this means Martin that the beam shape could be anything? Not a parabolic shape, and the offsets for the beams would come from buttocks,
could you incorporate such a factor as the one I descibed, like a button to auto shape the beam from the height above the end point like the factors .8818 and .5393 work well at 1/3 beam and 2/3 beam, actually I see a way of doing that already by control points, um er as soon as I figure how to add those points!!
you want to sell your pro versions down here, try Alloy yachts in NZ. dibley marine architects nz, sensation yachts nz, yachting developents nz, or look under
http://www.nzmarine.com/directory.php
thanks very much for delftfree, it is the only one with a decent tutorial, in my opinion