OPTIONS, HEAD, et. al.?

Folks,

I'm been reading up on the WSDL 2.0 HTTP bindings for use in the
DAWG's SPARQL Protocol for RDF.

One question I can't answer yet is whether (or how) an HTTP binding
for some interface can use an HTTP 1.1 method other than the Big Four
(get, put, post, delete).

I'm thinking specifically of binding to OPTIONS or, say, HEAD, which
can be useful in a variety of cases.

Is using, say, HEAD as simple as specifying it  as the value of
whttp:defaultMethod attribute in a binding? Like
<...whttp:defaultMethod="HEAD" ...>?

Thanks,
Kendall Clark