Description:
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I could be wrong in my understanding of oAuth 1.0a ... so I'm sorry if the 
following does not apply:

the extension doesn't seem to be able to sign requests with a custom HTTP Method 
(verb) with a payload ...

ex:
curl -iH "Authorization: OAuth {PARAMS-HERE}" -d 
"value1=foo&value2=foo2&value3=foo3 -X LINK http://domain.tld/api

signature always fails, because the extension does not grab the payload for none 
POST requests.

Expected result:
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the oaugh signature should always use the payload body params regardless of the 
HTTP Method.