Я возможно куда то не туда смотрю, но я невижу его в последнем девелопмент релизе.

вот все о чем знает NGINX:
roman@debian:~/work/src/nginx-1.3.9/src/http$ tail -n +4384 ngx_http_core_module.c |head -n 17
static ngx_http_method_name_t ngx_methods_names[] = {
{ (u_char *) "GET", (uint32_t) ~NGX_HTTP_GET },
{ (u_char *) "HEAD", (uint32_t) ~NGX_HTTP_HEAD },
{ (u_char *) "POST", (uint32_t) ~NGX_HTTP_POST },
{ (u_char *) "PUT", (uint32_t) ~NGX_HTTP_PUT },
{ (u_char *) "DELETE", (uint32_t) ~NGX_HTTP_DELETE },
{ (u_char *) "MKCOL", (uint32_t) ~NGX_HTTP_MKCOL },
{ (u_char *) "COPY", (uint32_t) ~NGX_HTTP_COPY },
{ (u_char *) "MOVE", (uint32_t) ~NGX_HTTP_MOVE },
{ (u_char *) "OPTIONS", (uint32_t) ~NGX_HTTP_OPTIONS },
{ (u_char *) "PROPFIND" , (uint32_t) ~NGX_HTTP_PROPFIND },
{ (u_char *) "PROPPATCH", (uint32_t) ~NGX_HTTP_PROPPATCH },
{ (u_char *) "LOCK", (uint32_t) ~NGX_HTTP_LOCK },
{ (u_char *) "UNLOCK", (uint32_t) ~NGX_HTTP_UNLOCK },
{ (u_char *) "PATCH", (uint32_t) ~NGX_HTTP_PATCH },
{ NULL, 0 }
};