I am finishing up an addition and need help with the siding. We would like to use fiber cement board with clapboard style boards.

1. Is it a good idea to miter the corners? i saw a thread that advised against it for Dutch lap style. Does the same opinions (that the joint can/will open up) hold for clapboard? The look of a mitered joint seems more consistent with the rest our house (which is vertically hung cedar)

2. Do most feel the investment of shears (as opposed to a circular saw with a composite blade) is worth it? I am not sure I could cut at a 45 (for the miter corners) with a shear.

Thanks in advance for any help.