We just tried downloading a file from a BearShare server using a LimeWire 4.2.4 client, and we didn't see chat specified in X-Features.

Is its presence conditional on something? I definitely have the Chat check box enabled in LimeWire.

Upload from X.X.X.X ("LimeWire/4.2.4") Processing request
--REQUEST--
GET /uri-res/N2R?urn:sha1:___K7ZU7QVCZHWFU7CE7RQBKOWMUFFME HTTP/1.1\r\n
HOST: X.X.X.X:6632\r\n
User-Agent: LimeWire/4.2.4\r\n
X-Queue: 0.1\r\n
X-Gnutella-Content-URN: urn:sha1:___K7ZU7QVCZHWFU7CE7RQBKOWMUFFME\r\n
Range: bytes=0-99999\r\n
X-Features: queue/0.1, fwt/1.0, fwalt/0.1\r\n
\r\n

--RESPONSE--
HTTP/1.1 503 Queued\r\n
Server: BearShare 4.7.0b43\r\n
Content-Length: 0\r\n
X-Queue: position=1,length=1,limit=6,pollMin=30,pollMax=120 \r\n
\r\n