Open Rails now includes a syntax which can be applied to .CVF files which allows you to modify the fonts used in digital cab displays. This is a huge improvement over the previous one-size-fits-all treatment in Open Rails. All it takes is adding and configuring a line in the .CVF file for each digital display in the cab, and it wont affect how MSTS handles it if you run in both sims.
An early problem in Open Rails, and one which hung around for a bit, was an inability to play a short horn blast — something necessary for common horn signals, including the usual North American long-long-short-long pattern for grade crossings. The basic horn behavior was resolved fairly quickly, but there were still a significant number of horns & whistles that didn’t play correctly, instead playing out a full-length blast regardless. The issue was figured out in the community and resolved by editing or adding in cue points (where they were non-existant) in the sound effect .WAV files. That has been the standard fix for a large variety of horns that don’t play correctly in Open Rails. Unfortunately, there have still been a few “unfixable” ones that didn’t improve with editing the cue points in a sound editor.
The solution turns out to be a parameter in the .SMS file that determines how the horn sound is triggered and stopped.