requirePluginVesions: avoid checking commandline-invoked mojos

Locking plugin versions affects also mojos invoked from commandline, which is typically undesired.
Besides that, such mojos cannot be even invoked with fully qualified name.

I am using following configuration in our corporate pom, to enforce that all plugin versions are explicitly declared so that builds are reproducible:

...
                  <message>ERROR: Please always define plugin versions.</message>
                  <banLatest>true</banLatest>
                  <banRelease>true</banRelease>
                  <banSnapshots>false</banSnapshots>
                  <banTimestamps>false</banTimestamps>
                  <phases>clean,deploy,install</phases>
...

With this config, I cannot use commandline mojos that are not mentioned with exact version.
One such case is mvn idea:idea which ends with enforcer failure.
Even worse: in this case I have no chance to invoke that mojo even with full qualifier - it fails as if I didn't specify version (maybe this part is a bug in different component):

mvn org.apache.maven.plugins:maven-idea-plugin:2.2:idea

I can theoretically add something like this to the corporate pom, and it really helps:

...
                  <unCheckedPlugins>
                    <unCheckedPlugin>org.apache.maven.plugins:maven-idea-plugin</unCheckedPlugin>
                  </unCheckedPlugins>
...

However, this approach is generally unusable, as it requires re-releasing of all modules descending from that pom - which is never desired and rarely possible.

A semi-solution idea:

This might be difficult to fix - but if the list of unchecked plugins was somehow externalizable, it would solve my urgent need.
For instance, add option unCheckedPluginList containing comma separated items - then I can reference a property defined in settings.xml from there.
That would work for me, because settings are not subject to releasing:

...
                  <unCheckedPluginList>${my.unchecked.plugins}</unCheckedPluginList>
...