The messaging app on the Custom ROM, Cyanogenmod is listed as Messaging (com.android.mms, version 4.4.2-fd1c7d4c47). This app has a very unique feature called "Delivery Delay" and can be manually adjusted from 5 second and increments of 5 seconds upto 1 minute. Should you decide to cancel the text, simply tap the message and can be edited and tap again to send. I would greatly appreciate if you could add this feature to your next update.

Thank you for publishing this otherwise very impressive app, Textra on the Google app store.

Mark