If you check possible account settings / defaults:
Code:
zmprov ga harry.helpdesk@managedemail.de | grep -i briefcase
you'll get something like
Code:
zimbraFeatureBriefcaseDocsEnabled: TRUE
zimbraFeatureBriefcaseSlidesEnabled: TRUE
zimbraFeatureBriefcaseSpreadsheetEnabled: TRUE
zimbraFeatureBriefcasesEnabled: TRUE
It seems there's no setting for "zimbraFeatureBriefcaseDefaultView". So it might be a good idea to file an RFE.