Is there a file that can be edited for the keyboard shortcuts in Open Office?

Eg,
In Writer, I can go Tools-->Customize-->Keyboard and can edit Shortcut keys. From this interface I can only set certain keys. I would like to set the shortcuts to be similar to MS Office. eg changing the font size with CTRL + [ and ].

This option is not available in the shortcut keys, and would like to know if I can edit some sort of file for their inclusion..

Thanks.