I beleive this to be more secure for higher permission accounts
I think the higher permission account holders are probably aware of the prefered method of logging in.
While I would not object to forcing all logins to occur via SSL, for those who wish to cache credentials this may cause a problem.
I do not want to log in every time I visit the forum.
If changing all the login URLs to point to a https page does not break that, then I do not object.