All valid points. I've been digging around quite a bit with this, and part of the solution (for now) comes from a suggestion made by Lokifish Mars (to use a third-party app), and part of this comes from the functionality on the TrueSmart (fragile as that might be), and of course partly by settings in the TrueSmart.
First of all - as you probably know - you set SWApps Link to
show clock face on startup. That's the easy part.
The second thing I did was disable the lock screen on the TrueSmart. For that I went to
Settings -> Device - > Display -> Lock Screen Notification and
de-selected that check box. (is there anything else that that user has to set? Maybe I already set it and don't know that it's tied to this - can it be that simple?)
The third thing comes from an oblique reference Lokifish Mars made to a free app called "
Gravity Screen Free". So far it's provided everything I've been looking for in terms of controlling when the screen turns on/off. This app allows you to 'tune' the screen state based on the device position (and use of other sensors). The TrueSmart does not have a proximity sensor, but it can do most of what you need using the accelerometer/gyroscope.
The really cool thing about this is that the watch is only on when you need it. So this can actually be *more* battery efficient - in that it turns the screen off after 1.5 seconds in the 'off' orientation. This is compared to the 'passive off' mode of using the TrueSmart, where I would manually turn it on at the button - and then put my wrist by my side and allow the timer to turn off the watch 15 seconds after the button press. This is wasteful and definitely shows up in the battery percentage at the end of the day. Now, my watch actually tracks *better* than my phone in terms of battery remaining at the end of the evening when I put them on to charge overnight.
The one minor drawback is that the TrueSmart doesn't have a proximity sensor. That means - if you want to set Gravity Screen to keep the scren on by wrist movement, you're risking false triggering. That's something I'm still planning on turning on, but for now I'm running with that feature turned off for a few days to see how the TrueSmart battery holds up with 'normal' use.
Incidentally - I also use Gravity Screen free on my phone, and it's pretty awesome. Since I'm usually device-facing I don't worry about screen locking too much. That, and SWApps Link is my failsafe, in that if the Bluetooth "Leash" is ever broken, the phone gets locked with a passcode. So when I come back to the phone (if I forget it and leave it behind when I go to a meeting or whatever) I can unlock it and then go to the settings to disable the lock screen again. And on the plus side, the phone has a proximity sensor so it is excellent for just dropping in a pocket and staying off regardless of the orientation (such as when I'm in seated position and the phone is above the angle for switching on... the proximity sensor keeps it off). So again, this actually has the side benefit of extending the phone battery in that the screen isn't on for longer than it has to be.
I've been advocating for the same type of positional sensing features to be put in SWApps link "natively", because I too want to use the app as my main view when looking at the TrueSmart.
Anyway - I hope this helps you get past the geek tech aspect of setting this kind of behavior for the TS. If you're into this kind of hands-free mode, it'll be difficult to consider using the TS any other way.