Many thanks for this Christmas present [=D>]
I have to thank you for at least one reason:
- You've save me for a lot of work!
BUT
"No good deed goes unpunished!"
So:
1. About regulations:
1.1. The local regulations have to be known and respect by the locals. That's the way a society works.
1.2. We have to respect also some generals rules (mathematics, ergonomic, etc.).
There is some ideal standards and there are some recommendations when you input some custom value:

Recommendations:
Deviation from the sufficient comfort level formula 49,49 %
We recommend to increase the amount of steps 2
Stair depth is sufficient
Not an ideal stair angle (slope) 29,1° , less 30°
We recommend to shorten the overall run X to 49 mm
Or use different dimensions for your staircase
Uncomfortable staircase

Something similar could be shown in plugin. Warnings not limitations!

2. About limitations:
2.1. The tread thickness maxing out at 30 mm it's not enough but not more than 60 mm.
2.2. The stair height has to be limited at max. 40 cm. More than that you have to climb not to step.

3. About properties:
3.1. From my side could be good to have an Modify stairs entry active when a staircase generated with this plugin are selected.
3.2. On this new window we could personalize some parts with aid of some specific library (hand rails, balusters, several types of steps)
3.3. If we have this kind of approach I could (I really want to) use it on Generate Roof for similar purpose.

4. About Look & feel:
4.1. It's an very old problem: all staircases looks unreadable in 2D plan regardless of the texture or color you use.
4.2. An suggestion is to add some black edges OR to have an more performant image generator.

If you don't sleep already,
I wish You all a Happy New Year! [:o)]