And while I'm thinking of things 
it would be cool if the settings for the stair are stored in the created object, so you could reopen the dialog, tweak the setting for that stair object, then update/replace it. This would allow easier experimentation. I found it hard to configure an exact 180 degree spiral for example.
That would be a great advantage while designing the stairs. It's something I also wish could be done with the Generate 3D Shape tool: right click the shape and read it back into the tool window. For the Staircase Generator it might be even more desirable. it would be cool if the settings for the stair are stored in the created object, so you could reopen the dialog, tweak the setting for that stair object, then update/replace it. This would allow easier experimentation. I found it hard to configure an exact 180 degree spiral for example.Maybe the best option is to have a function to save the configuration to a file and have the option to read back such a configuration (i.e. save as <staircasename>.scc StairCaseConfig). Such a workflow could be used for similar generators as well.
Regulations differ per country/state so it's impossible to incorporate them by default. There are even different rules depending on the place and function of the stairs. I did some heavy research when I designed my public staircases and I tried to stay as close as possible to the most common regulations for public staircases, which differ greatly from the regulations for home staircases.
I suggest that anyone who wants to stay close to the regulations for his country to just look them up and use them as a guide line to create the staircase. The most important ones are min/max sizes of threads and risers, the min/max depth of the staircase for a set elevation (i.e. the number of threads before a landing is required). One 'advise' for public staircases I didn't follow was adding a nose that extends over the previous thread. That's not advisable for public staircases for safety reasons. That's also why you can make them invisible
As it is the Staircase Generator plugin is great. Any finetuning can only make it better.
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