Setting KNX Response Timeout

Dear KNX-Users!

Problem: I’ve shutters that drive more than 10 seconds until they are closed. Unfortunately
sometimes I get an error (ACK no response -> KNX Disconnected -> KNX
hangs).

Question: Is there a possibility to change the READ_RESPONSE_TIMEOUT in
KNXIpConnectionManager.class or can somebody compile a version with higher
timeout (e.g. 8000 ms)?

Target:

Controller 2_1_0 with Java 1.6.0_38

Thanks a lot!

Greetings

Sigi