The problem is, that with locked phone, we lesser our chances to retrieve phone - as normal solution for thief - when facing locked phone - is to flash it (or give to someone else to flash). This way, without knowing it, he also get rids of SMSOCN.

Optimal solution would be to have lock code present - to protect device from spying eyes and for protection of truecrypt partitions/volumes - but, to have a way to auto-disable lock code, when phone is in "stolen" state. This way, we present thief with "usable" phone (without access to our private things via truecrypt), so odds are, that he won't even flash it.

Ho ever, I've no idea how to achieve it

@yablacky
Method I've described (to reset security code) is only useful, when device have lock code set, but not asked during boot. Of course, You're right that there is no way to reset it when it's asked during boot, other than flashing.
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Maybe SMSCOC should have a small part run via U-Boot/backupmenu? This way, it could reset lock code in a way we can do this via recovery console, manually (generic one, or bundled in backupmenu). After all, with proper mounting, everything can be achieved from recovery console - so, some script to automaticaly disable lock code, when pre-defined conditions are meet, should work too.

/Estel