Why must "original domain" be set in Domain Mapping for Videos to work?

OK, the title is self-explanatory I guess.
I have the Domain Mapping plugin set on Mapped Domain, but now the Integrated Videos Plugin is unusable:
"Displaying support videos in the admin area of sites is incompatible with your domain mapping settings. Administration mapping must be set to "original domain" to display videos in the admin area."
When I do so, I get ugly URL's on admin side, like customer1.mysite.nl/wp-admin instead of customer1.nl/wp-admin, what I have (and want) when Domain Mapping is set on Mapped Domain.

Is this very hard to code to get it working? Perhaps for a next version?

Thx and kind regards,
Ronald