In the rule you should be able to have an expression with 

Stream.Read(some number of character.. you might consider 3200000)  

to get the first X characters of the stream content... of course assuming the thing you are searching for can be found in that string.

My experience is the developer room offers the best opportunity to interact with the InterSystems developers, this is the most rewarding part.

Not entirely dogmatic but I've always found https://github.com/jnguyen095/clean-code/blob/master/Clean.Code.A.Handb… to be a good guide.

this has sections on veriticle and horizontal formatting/density/distance.  Again, not a specific answer but I use it as a guide.