Is it possible to add a smart group in DTTG that displays all records with reminders?
AFAICT, that is not possible. But you could create a script that either
- marks all records with reminders (tag, flag, a custom meta data thingy, whatever)
- copies or moves all records with reminders to a group.
This could be executed from a smart rule or manually.
A smart rule using this script Smart Folders in DTTG: an approximate solution - #3 by cgrunenberg could actually be used to mirror any smart group automatically.