Redmine

As version 0.50 redmine doesn't support concurrency control on wiki.
I've been searching around, and found this info on the wikipedia:
http://en.wikipedia.org/wiki/Optimistic_concurrency_control

wich says that rails already provide concurrency control, and in fact there are Optimist and Pessimist concurrency control
in rails.

I'm not sure about the time needed, and difficulty to add support, but it would benefit a lot redmine, because it will
provide team work on project documentation.

Thanks for all!