Default Stack Size to Max, Default Partial Stack ON!
Please make the default Stack Size to max, and make the default Partial Stack option On.
There was a previous post declined in 2017 stating:
"Many (if not most) things people use TSM to sell can’t stack above 1, so this would cause way more problems than it would solve."
However this is disagreeable and irrelevant with current versions of TSM. That issue can easily be corrected by enabling the Partial Stack option. Most people change these settings for #Default anyways. It will also assist in keeping the AH from being filled with 1,000 entries of 1 stack items, causing AH scans to take alot longer, and more problems like game crashes when scanning.
Also, per the Blizzard changes stated at"
Automatically posting at 1 per stack will cause higher fees and less profit.
Or create an introduction popup on newly installed add-on with a few quick questions, with this option as one.