Custom Start Location for Spiral Flight Plan

I have noticed the default Start location when using Spiral Flight Plan, is furtherest south.

In my case this location could be more than 10km from where my base location is thus adding a lot of time to the start and end of the mission. (Survey Boat)

Is there currently an option where this can be changed?

If not, this will be another great option for a future update.

Thank you
John Easton