Your English is fine!   That's something that is being looked at for version 3.0.0.  I can't give a release date (I have no clue at this point) however it should only be a few months away. 

Herein lies the problem.  Currently, the code that handles this is spread out from several files.  The main one being the monitor.php in the /class directory.  My thought on the matter is to output to the operator (the one that missed the chat) something to the effect of chat missed or chat transfered, and turn off the link to accept chat.  This would accomplish what you desire, force a status change, and also inform the operator that they missed the chat.

Also note that if you change this file, you'll have to track any changes to the system with future releases (which hopefully will be few before version 3 is released).  That is the one problem with hacking the existing core of the system.  On the other hand, if you get something workable we are willing to import code into the base system, so if you can find a good way to do this without causing grief for others, it could become part of the standard code.