Thanks Bucklash, I tried it but it doesnt work as needed.
Ideally I imagine it like this: In adminpannel creat a copy of User type with only standart joomla fields and in SiteForm set for all fiels live value as current user. Then output this form in new menu item. Actually I got the right results in a form, but after submitting the seblod tries to create a new user. So, the questions are how to stop creation a new user and how to change the current user with new values from this form? I think it could be conrolled by the BeforeStore or AfterStore plugin, but I dont know how,
Any suggestions would be appreciated...