This is an OEM "safety" feature. It has nothing to do with aftermarket parts or alarms. Most cars made after 2003 are going to have automatic door locking occur when you put the automatic transmission into gear. Stick shifts do not have it. I have two WRXs: one is stick shift, and one is automatic. I cannot stand this feature on my automatic.
Now, does anyone actually know how to disable it on Subarus?
You'll need to provide more details about your location and vehicle if you expect to get some reasonable answers.
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MY'03 XS AT offroad; MY10 Triton GLX-R
MY'97 Outback RIP
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The fact that stock Forester doors (at least up through 2018) don't automatically lock is the subject of a 17 page discussion in our Irreconcilable Differences Threads. We have seen reports here that it's selectable on the 2019s, but our 2019 knowledge is still evolving.