Possible bug in svn vcs plugin

I Think there is a bug in the svn plugin possibly other VCS plugins as well.

When you execute teamcity via wget as documented in
http://confluence.jetbrains.net/display/TCD6/Accessing+Server+by+HTTP#AccessingServerbyHTTP-TriggeringaBuildFromScript

for example :
wget http://username:password!@teamcityserver/httpAuth/action.html?add2Queue=bt4&system.name=TAG_NUMBER&system.value=3.6.9.2

Build definition bt4 queues with the System parameter TAG_NUMBER set to 3.6.9.2

If you create  a command runner step with echo %system.TAG_NUMBER%  the result will yield 3.6.9.2

However in the svn VCS plugin if you add a check out rule +:%system.TAG_NUMBER%=>.

which says only checkout %system.TAG_NUMBER% and send it to the root of the BuildAgent working directory

it will not work.

Furthermore if you preinitialize system.TAG_NUMBER to say 3.6.9.1 the svn VCS plugin will
pull from the 3.6.9.1 subdirectory yet the rest of the build will have 3.6.9.2 as the value
of system.TAG_NUMBER.

Any work arounds would be appreciated.