Enabling Snapshots For All Maven Repositories

Question

We have set up a local Maven repository for all development teams to use. It proxies external repositories and acts as the corporate artifact repository. We can control all access to external repositories through our local artifact manager.

We have distributed a settings.xml file that sends everything to that repository:

<?xml version="1.0" encoding="UTF-8"?>
<settings xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.2.0 http://maven.apache.org/xsd/settings-1.2.0.xsd" xmlns="http://maven.apache.org/SETTINGS/1.2.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <mirrors>
        <mirror>
            <id>internal-mirror</id>
            <mirrorOf>*</mirrorOf>
            <name>Pseudo repository to mirror external repositories.</name>
            <url>https://10.10.10.10/repository/maven/</url>
        </mirror>
    </mirrors>
    <servers>
        <server>
            <id>internal-mirror</id>
            <username>someusername</username>
            <password>somepassword</password>
        </server>
    </servers>
</settings>

All pom files in all the projects only have distrubutionManagement section defined so they can publish releases and snapshots.

All is good and everything works great. Except for snapshots. Maven does not allow snapshots by default, so we have to specify <snapshots><enabled>true</enabled></snapshots> somewhere.

Our goal is to enable snapshots with the least amount of code changes possible, preferably through the settings.xml file. We want to avoid having to update every pom.xml in every project, if possible.

What is the best way to enable snapshots in Maven using our local artifact repository?