It might also be nice to be able to register some global converters. I noticed that for each core a new SolrTemplate that's created the default converters are used.
SolrRepositoryFactory L83 SolrTemplate template = new SolrTemplate(factory);
Maybe a bean reference to a global 'solrConverter' can be included with the @EnableSolrRepositories(multicoreSupport=true)? For some use cases, this might be sufficient if the same conversions are needed across different cores in the case of denormalized data