The 25-pin balanced I/O connectors on the ADDA card exactly match those on the back of Tascam's DAx8 recorders. This means you can buy readily-available snakes, usually available with TRS or XLR ends. The Tascam decks and the DA7 use Japanese ISO threads on the connector hold-down screws; don't try American (SAE) screws or you'll strip the threads. Hosa provides two types of hold-down screws with their DA88 snakes: ISO and SAE (US) threads.
Analog inputs 9-16, which have TRS jacks, also can accept mike-level signals. You just need an XLR-TRS adapter: a simple connector change is all you need, so don't bother with one of those transformer-based XLR-to-unbalanced adapters. They cost more and might affect the sound.
If you choose to feed line-level signals into Analog inputs 1-8, be sure to turn off Phantom Power! Having 48VDC coming back into some device's output isn't nice at all.
Don't use Scene Memory 00 to store a scene you want to keep. It's overwritten with the Start Scene when you begin recording automation.
Plugging in headphones doesn't mute the monitor outputs.
The meter bridge display matches the screen. When you change the metering position in the circuit (pre-eq, pre-fader, post-fader), the bridge and screen displays agree. The bridge also usually follows the fader-layer selection made on the mixer – or you can manually choose a layer on the bridge.
Word Clock settings are not part of Scene memory.
It appears that the automation doesn't record AUX Send on/off events, only level changes. I think you can get around this by using the Event Edit window to change the event type from something else to an AUX on/off.
The automation only records Delay on/off and Dynamics on/off events, not the actual parameters (e.g. delay time, threshold, ratio, etc).