There are still some problems:
1. from error.log:
[NOTICE] [FrontPage] //home/user/public_html/_vti_inf.html is missing!
[NOTICE] [FrontPage] ownership of //home/user/public_html/_vti_inf.html does not match ownership of document root!
2. the _vti_pvt/service.pwd file have by default permissions 0600, so LSWS can't access to that file. If there is a necessary, I may try to do some changes in cPanel files, which sets permissions to service.pwd.
3. after upgrade lsws, I had an error 403 for all _vti_*/* files
4. now the FrontPage Extensions doesn't work, but I don't know why
4. what will happen if somebody add FrontPage Extentions for his account in cPanel (cPanel isn't reloading lsws after that)?