Hey, thanks, my english is not the best - but today I found a script, that is useful - but not at all, because it changes the curve in e very heavy way ... I mean the DELCORNERS script, I found it here

http://moi3d.com/forum/index.php?webtag=MOI&msg=6058.43

But my solution is - Rebuild the curve with more points and after that - DELCORNERS Script :) ... but maybe - its my suggestion - this script should delete the corner and set two or one smooth corners in close to the corner :)