Decimal in bulk edit & CSV delimiter

Hello,

Nice plugin.

There are two problems in my wp edition.
How can I change dot to comma and opposite for thousands and decimals in online edit?
When I change both the delimiter , for example to use semicolon for both import and export, when I am trying to import there is failure message for importing in relation to the delimiter, How could fix it to avoid problems with the use of comma in the fields?

Thank you a lot
Manolis