SYMPTOM
Users want to create a subscription with CSV delivery format and they noticed that delimiter options are missing. However, delimiter options are available while exporting a report by selecting Export/ “CSV file format” option from the “Report Home” menu in Strategy Web.
The image below shows that there are no delimiter options in Subscription editor:

The image below shows that options are available when exporting to “CSV file format” from “Report Home”

CAUSE
This is a limitation of Strategy Web and an enhancement for the product was submitted.
ACTION
Currently, this issue is still being reviewed for feasibility by our Technology team and it is not scoped for any upcoming scheduled Strategy release.