this is not a click with mouse to walk game!
you can still get that 360 control with kb+m tho. i never tried it, since i severely detest playing combat heavy games with kb+m but i can repeat what others said to a lot of people who felt the same:
you can move completely freely, you need some input from your kb but you can then walk/jump/run/attack towards your cursor. i hope some kb+m people jump in and help out here.
as for the custom cursor, the dev team is aware, and i am sure it will come at some point. there is a discussion about it here: PC version: Custom Cursor