GMaven & source encodings

I'm re-posting this because I made some more discoveries after I had initially posted it.

I discovered apparently SourceEncoding is completely broken in GMaven. I tried on Linux where the platform default encoding is UTF-8 and on Windows XP where the platform default encoding is Windows-1252. In both cases, it used ISO-8859-1 as the encoding of the class file it generated, despite the fact the source was encoded in the platform default encoding. I tested this with version 1.2 of the plugin and Groovy 1.7.0. Why this is happening makes no sense to me; I could understand if it used the platform default...but why always ISO-8859-1? I think this is the Jira for this: http://jira.codehaus.org/browse/GMAVEN-13.
I find it shockingly disappointing that a 'critical' issue can go unassigned for almost an entire year. I wonder if it is working in Ant. Their documentation seems to suggest that it does. If that's true, it might tell us something about where the Groovy team's priorities are.

In practice, this often is not problem, since if you're only using ASCII characters in your source code, the first 128 bytes have identical mappings in UTF-8, ISO-8859-1, and Windows-1252, so it won't matter which of those the plugin tries to use. However, I view this as a major obstacle to Groovy's gaining dominance, as it should support Maven (since for better or worst it's become the leading standard) and it should support encodings to support global growth.

Am I missing something? Any good workarounds? I'm also happy to share my experiment project with anyone who wants to play with it.

I've also discovered yet another way in which GMaven's documentation is fail. I was trying to get my project to work with the latest version of Groovy, when I came across this unrelated StackOverflow discussion which use the new 1.2 version of the plugin (which isn't in the archetype or anywhere documented as released -- I thought the artifacts were released by mistake since nothing has even been tagged in their repository for 1.1 or 1.2, although IntelliJ already supports it, plus nabble and some blogs talk about it so I guess it is released). Here are the needed bits from the pom:

<dependencies>
    <dependency>
        <groupId>org.codehaus.gmaven.runtime</groupId>
        <artifactId>gmaven-runtime-1.7</artifactId>
        <version>1.2</version>
    </dependency>
    <dependency>
        <groupId>org.codehaus.groovy</groupId>
        <artifactId>groovy-all</artifactId>
        <version>1.7.0</version>
    </dependency>
<dependencies>
<plugins>
    <plugin>
        <groupId>org.codehaus.gmaven</groupId>
        <artifactId>gmaven-plugin</artifactId>
        <version>1.2</version>        
        <configuration> 
            <providerSelection>1.7</providerSelection>         
        </configuration>
        <executions>
            <execution>
                <goals>
                    <goal>generateStubs</goal>
                    <goal>compile</goal>
                    <goal>generateTestStubs</goal>
                    <goal>testCompile</goal>
                </goals>
            </execution>
        </executions>
    </plugin>
    <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>2.3</version>
        <configuration>
            <source>1.6</source>
            <target>1.6</target>
        </configuration>
    </plugin>
</plugins>

Update: According to this Jira, this is fixed in the 1.3 release. And it appears from my tests that this is the case.