These are a few things I have thought of or observed in the few weeks I have been experimenting with SmartThings:
I would like to see a slightly smaller Multi-Sensor. The current one is a bit too big and blocks the channel in my window frames where the screens fit.
The mounting adhesive has failed on two of my Multi-Sensor. I have replaced it with a wider strip of 3M automotive trim tape (which seems very similar to what you are supplying).
The recesses in the Multi-Sensor for the adhesive aren’t sized correctly for the pre-cut adhesive strips (or vice-versa). Also, depending on application, the recesses may not be on the correct surface for mounting.
While you are re-engineering the Multi-Sensor, it would be nice to make contacts accessible so you can trigger the contacts with a remote/hard-wired switch. I have been able to hack this by soldering wires to the Hall Sensor but that may be more than most people want to do. Note: It appears the Fibaro Door/Window Sensors have this capability.
In light of the failure I experienced with the adhesive strips, it would be nice if there were mounting holes, cast in but not all the way through so they could be easily opened with the head of a screw.
I would like to see you all make a Multi-Sensor that could be used outdoors. Also a motion sensor that can be used outdoors.
When I have installed new sensors and added them to the network, sometimes the battery capacity remaining has been 100% and sometimes it has been 80%. I don’t feel good about a brand new product telling me it has 80% capacity . . .
I would like to have the ability to “Suspend” execution of a SmartApp without having to Uninstall it. Maybe there’s a way and I just haven’t found it.
It seems like I have a lot of different places I have to log in to do various things on the web site. I would like to see some consolidation of that. It also seems like there are too many places I need to go to look for information. I like the re-designed support page - I think that was a big improvement.
I like the developer area and the emulator is cool. I would like a better way to browse and search through existing SmartApps when I am looking for one to plagiarize (re-use).
On the smartphone app, I would like a logical place in the dashboard to put window sensors (probably with the doors and just change the title).
Reliable and timely presence notification using an Android phone (mine seems to take between 20 minutes and 2 hours to recognize I am home).
I Really REALLY want SONOS to work. I see Sonos as the “voice” of SmartThings.
A way to have multiple Modes (there’s another thread here, “Thoughts on Modes”, with some good suggestions).
I’m sure I will think of more . . .