In 6.2 - how "expensive" is to add / to drop metadata fields local.xxx?

[Evgeni Dimitrov]

I have to migrate a small EPrints repository to a collection in DSpace. I need some more metadata fields. Like local.contact_email, local.official_url, ...

Is it enough to add the fields in ...dspace_6.2_src_release/dspace/config/registries/local-types.xml ?

If I add a field and then I drop it or rename it - will this have some "cost"? When no items are using the field of course.

I will populate the fields either with mets and crosswalk (for the migration) or with input form (later).