Hi,
this is a frequently asked feature. We do not plan to implement this, as it
is dangerous unless (and even if) you are not aware what you are doing. A
VPN provider basically is a self-made MITM (Man In The Middle), and even if
they promise not to keep logs, etc., there is no way of telling whether they
are doing so or not.
In the past, some VPN providers have been blamed of being owned and/or controlled
by intelligence agencies. Since you cannot be sure the VPN provider of your least
distrust does not belong to this category, you never want to route any traffic
through them.
For increased privacy, please consider running an upstream proxy (which you
can easily configure in the web interface) and/or use something like Tor.
I am aware of security problems with Tor as well (deanonymisation via traffic
flow monitoring, etc.), but at least it is more complicated to disclose your
identity that way. If you are behind a VPN provider, there is one entity
knowing both your true identity (i. e. public IP address) and the one you hide
behind (i. e. public IP address of the VPN provider) - if this entity is compromised
or forced to cooperate, your privacy is gone.
Thanks, and best regards,
Peter Müller