[BUG] gitk and "Ignore space change" option

Debian/testing, git version 1.7.8.3

There is no possibility to:
1) save value of "Ignore space change" option into config file (~/.gitk)
2) pass some option in cmd line (like --ignore-space-change or -w)

So, there is no other control to "Ignore space change", except via configuration dialog. This is very inconvenient, and I think this should be considered as bug.

As solution, any of (1) or (2) could be implemented, but if both - then this will be fantastic :)

Thanks!

PS: could be useful -
http://stackoverflow.com/questions/8221877/gitk-setting-ignore-space-change-option-to-be-true-by-default