I’d like to suggest a few improvements:

1. Adding the option to set Sahur and Fajr time based on an angle (sun inclination angle) calculation. So that I can set the sahur at -18deg and to be safe for fasting and Fajr at say -12deg to be safe for praying. Using 10min offset for the -18deg Fajr time doesn’t work for high latitudes.
2. Adding a second Asr timing: first being the 1x shadow length and second being the 2x shadow length so that I can pray within the preferred time window.