Yes.

In component’s options you can type what currencies will be available for users to choose while adding their ads.

Please note: this is just a currency sign, no currency conversions will be applied.

Settings in options

In back-end open Components -> DJ-Classifieds -> Options -> Global tab -> Prices settings section 

and in -> Price unit list type currencies seperated by semicolon (;) and Save settings.

Front-end

Now when user submits the advert on front he'll be able too choose the currency.