Change default store and forward mode

Hi all,

I hope a developer can help me with this one.

We need to send our messages with message mode 0, instead of message 
mode 3 which is default in Kannel. Unfortunately this setting is 
hardcoded. I thought I could easily change this, so I changed the code. 
I used the 1.4.3 stable release.

Then I changed /gw/smsc/smsc_smpp.c at line 851, it now says:

     pdu->u.submit_sm.esm_class = ESM_CLASS_SUBMIT_DEFAULT_SMSC_MODE;

I did make again, make install, and tried to start kannel again. But the 
bearerbox gives me this panic:

2010-01-15 15:16:24 [28251] [11] PANIC: gwlib/gw-rwlock.c:137: 
gw_rwlock_rdlock: Assertion `lock != NULL' failed.
2010-01-15 15:16:24 [28251] [11] PANIC: 
/home/kannel/sbin/bearerbox(gw_panic+0xbc) [0x80cfaec]
2010-01-15 15:16:24 [28251] [11] PANIC: 
/home/kannel/sbin/bearerbox(gw_rwlock_rdlock+0x6c) [0x80c4c4c]
2010-01-15 15:16:24 [28251] [11] PANIC: 
/home/kannel/sbin/bearerbox(route_incoming_to_boxc+0x5a) [0x80559ba]
2010-01-15 15:16:24 [28251] [11] PANIC: 
/home/kannel/sbin/bearerbox(bb_smscconn_receive+0xb33) [0x805c803]
2010-01-15 15:16:24 [28251] [11] PANIC: /home/kannel/sbin/bearerbox 
[0x808af0d]
2010-01-15 15:16:24 [28251] [11] PANIC: /home/kannel/sbin/bearerbox 
[0x808c1b0]
2010-01-15 15:16:24 [28251] [11] PANIC: /home/kannel/sbin/bearerbox 
[0x80c5e6d]
2010-01-15 15:16:24 [28251] [11] PANIC: /lib/i686/cmov/libpthread.so.0 
[0xb7f224c0]
2010-01-15 15:16:24 [28251] [11] PANIC: 
/lib/i686/cmov/libc.so.6(clone+0x5e) [0xb7b7d6de]

Is there something else that needs to be changed? Is there a patch 
available that changes the default esm_class?

Help would be much appreciated!

Kind regards,
Roland.