Home and waypoint questions

Hi everyone.
I have two questions:
I have a mission containing several waypoints(let say 10), but time to time I want my rover to go only to one point(e.g. 5) Is it possible to execute such an action from Tower?
Is is possible to change home location when GPS position is already locked?
I can see home icon can be freely moved, but how to upload it to APM?
Im using Tower with Rover (APM 2.6)…