dselect + apt method do not mount /usr ro when removing a package?

[Shaul Karl <shaulk@israsrv.net.il>]

Am I correct that dselect apt method does not handle /usr which is mounted ro 
correctly when it tries to remove a package?

Although I have 

[21:28:22 /tmp]$ grep Pre-Invoke /etc/apt/apt.conf 
    Pre-Invoke {"mount -o remount,rw /usr";};
[21:28:32 /tmp]$ 

when trying to remove a package, dselect reports that:

running dpkg --pending --remove ...
(Reading database ... 37918 files and directories currently installed.)
Removing adjtimex ...
rm: cannot unlink `/usr/doc/adjtimex': Read-only file system
dpkg: error processing adjtimex (--remove):
 subprocess pre-removal script returned error exit status 1
Errors were encountered while processing:
 adjtimex

dpkg --remove returned error exit status 1.
Press RETURN to continue.