> In its latest version BidiEngine was instantiated, and I tried to recreate it here as close as possible to the original. 

Just FYI this is not part of our goal to stick as much as possible to what exists. If what exist is wrong we want to fix it (might not be the case here).

> Yes, current implementation doesn't require instances. However it may be subclassed with the goal to extend its functionality, for example, by working with maps (we will have to keep some internal data for future use), or it may be changed to provide more convenient work with its parameters (we will not have to pass the same parameters in multiple call functions, that perform the same type of transformation). 
If you agree with this, I will add set/get methods for layout parameters (and rename our module to LayoutEngine or TextLayoutEngine, just as you ask to avoid repetition of the word "bidi" in the name of the module). If no, I will do what you ask in the previous comment.

I think what you are proposing might make sense, so please give it a try. Please note that getters/setters must be of the ES5 form (not setXX, getXX methods). See: https://github.com/ibm-js/sdk/blob/master/GUIDELINES.md