vendor tracking from external repository possible?

I discovered that it is possible to merge from
an unrelated url into my working copy.

e.g. my working copy is at repository url
https://myserver.top/svn/project/vendor/current

Now I use tree merge started on this WC with urls:
from http://coolaps.org/svn/cool/tags/1.34.0 HEAD
to http://coolaps.org/svn/cool/tags/1.35.0 HEAD

and select "ingnore ancestry".

This merges into my repository, which I can commit afterwards.

I have been told this is not possible with cmd-line
svn. Is this an extension in the tortoise client (1.5) ?

Are there any pitfalls I should know before trying to use
this for vendor tracking?

Thank you.

-- 
_________________________________________
  _  _  | Roland Schwarz
 |_)(_  | aka. speedsnail
 | \__) | mailto:roland.schwarz_at_chello.at
________| http://www.blackspace.at
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