This is quite easy to fix: ->download and patch sources ->in buffer.c go to line 205 and use higher value (e.g 2^24) ->to be able to use more shared mem "echo [max_mem] > /proc/sys/kernel/shmmax" also use a bigger value (e.g. 500000 for 500MB)
If you want to increase your maximum blocksize, look at line 192. Btw why do u guys don't patch this, it would help a lot.