Some of the coins have some of period slots always greyed out. The “Reminder” option on the mobile app does have its limitation, but since the option to stake some coins can have a small window of opportunity is really small, if there would be implemented a reservation system for locked staking (by locking in advance the assets), the users would benefit by not having to refresh the availability in some cases for days, while binance will get feedback which coins need their “Data Projects Uplimit” being increased.
Thank you for your suggestion, I will share with team.