Time delayed text messages
It would be handy to have a time delayed messaging option so that you can for example schedule a message for a giveaway, or message a family member after they've awoken in the morning to remind them to do something.
Seeing as the Pinephone for example goes into sleep where it cannot send SMS afaik, it could possibly use the RTC of the device to wake it up at the exact time it needs to send the message, and then on wake spacebar's backend could then send the scheduled message out, afterwards letting the phone drift back into sleep mode.