Continue mode in fish protocol - change ibs?

Hello, 

When using e.g. get -c in fish dd first uses a lot of cpu doing nothing
(in fact seeking in the file).

Could it be possibile to increase input block size for dd command?
That would of course mean that you'd need to reget part of the file (i
think ~2K block sizes would be anough, that would mean in worse case you
would need to reget 2K). 
The best if the block size was configurable.

Also there seems to be a bug somewhere in the fish protocol handling.
Suddenly the output of the file started to be outputted on stdout/stderr
(at least it seemed so). Maybe it was because the remote file was
growing when i was downloadin it?
I'll try to debug it.

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