I did want to note that other EXT you linked is for PF1. This is a 5E ext.
Might have more to do with PF1 system than anything else.
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"some of this listed as functionality in exts for 5e."
I wouldn't call that it's 5e ext.
Also it is listed in the PF1 exts.
As you can see in the code here, you wouldn't even be able to load this without editing this for 5E.Code:<root version="1.0" release="1">
<properties>
<name>Combat Modifier Calculation</name>
<version>1.0</version>
<author>dogfisc</author>
<description>Extension</description>
<ruleset>
<name>PFRPG</name>
</ruleset>
<ruleset>
<name>3.5E</name>
</ruleset>
<loadorder>100</loadorder>
</properties>
<announcement text="Combat Modifier Calculation: Automatically calculate modifiers for flanking, range, and shooting into melee" font="emotefont" />
<base>
<includefile source="desktop/desktop_classes.xml" />
<includefile source="gameelements.xml" />
<includefile source="utility/utility_modifiers.xml" />
<includefile source="strings/strings.xml" />
<script name="ActionAttackCustom" file="scripts/manager_action_attack_custom.lua" />
<script name="DataCommonCustom" file="scripts/data_common_custom.lua" />
</base>
</root>
I bought Kents Flanking extension for 5e and made some changes to get it to work for 4e. The extension patch you made works with it, only adding the 4e ruleset check to extension.xml.
Wont be any use to others as I dont know how to make a patch extension of the changes made to Kents code. :-)