Hi,
Welcome to the forum and thank you for the kind words.
I will list your suggestions in the issues list for feature additions.
Precipitation accumulation for the entire forecast or for a selected period is planned.
Gust display needs to be thought through as gust values do not have direction. Perhaps contour color shading with numeric values and no wind arrows could be considered.
I will look into the possibility to add sub-region borders in gshh maps.
David