I should not work late at home ;).
The doc is right, default value is "yes".
BTW: in the coming 2.20, yes / 1 / true are the same (same for no / 0 / false). For historical reasons the value differs depending on the attributes, but this is not convenient, so this will be "solved" in 2.20.
I'm using the following .4st
<Style name="TextEdit.local">
<StyleAttribute name="localAccelerators" value="yes" />
</Style>
<Style name="TextEdit.nolocal">
<StyleAttribute name="localAccelerators" value="no" />
</Style>
Actually, this has been designed for tables, so it does not work (today) with Matrix / Scrollgrid. As nothing is defined in the doc, it can be considered as a bug (#11482).
I invite you to contact your support center for timeframe / availability questions.