Support for only showing part of the board

[bixbyr]

I'm considering using tenuki for a tsumego website along the lines of what GoGrinder used to do locally. For tsumego it would be really helpful to be able to only render enough of the board to contain the problem. It's up to the user to know how large of a region they require, but could I put in a feature request to support only rendering a corner of the board?