It seems that it's currently impossible to customize the code generation feature as documented in the maven-jibx-plugin (schema-codegen goal).

When trying with the <customizations> tag as following (for example) :
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<configuration>
<customizations>
<path>
../generation-config/${schema.provider}/${schema.version}/jibx.xml
</path>
</customizations>
<directory>../generation-schemas/${schema.provider}/${schema.version}</directory>
<includes>
<include>${schema.includePattern}</include>
</includes>
<verbose>true</verbose>
</configuration>
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we get the following error :
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Command line options must precede all other arguments: error on '-c'

Usage: java org.jibx.schema.codegen.CodeGen [options] schema1 schema2 ...
where options are:
-c path input customizations file
-d file for dumping the generated class structure
-n pack default package for no-namespace schema definitions
-p pack default package for all schema definitions
-s schema root directory path
-t path target directory for generated output (default is current directory)
-v verbose output flag
-w wipe all existing files from generation directory (ignored if current
directory)
The schema# files are different schemas to be included in the generation
(references from these schemas will also be included).

Terminating due to command line or customization errors
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and by the <options> tag (which is supposed to manage the same options as the CLI ones, e.g. -c -d -n -p ....) :
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<configuration>
<options>
<c>../generation-config/${schema.provider}/${schema.version}/jibx.xml</c>
</options>
<directory>../generation-schemas/${schema.provider}/${schema.version}</directory>
<includes>
<include>${schema.includePattern}</include>
</includes>
<verbose>true</verbose>
</configuration>
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we get this one :
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[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Parameter c not found
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and have no idea of which parameter tags are allowed as child of the <options> tag