The first issue has been resolved in SUBSET07JUNE2018.zip. Thiis patch will put quotes now, if they don't exist, for non numeric columns. Please contact CA Support for this version of SUBSET or later. If you are installing a GA Version after June 8, 2018, please contact Support to verify that the fix made it into that version.
For your second question that is an enhancement, this has been turned into an Enhancement - US506435. This will be put into the Development Process. Please contact CA Support if this User Story US506435 has been implemented in the latest GA after July 2, 2018.