Allow User to Customize lines that separate weeks in Roadmap Merged

I would like to be able to customize my view to have lines that separate/break up the weekend, as we do two week sprints and I plan all tickets for two sets of Monday-Friday.  I would like a line between Friday and Saturday and a line between Sunday and Monday.

This would also be useful for small teams(startups) that work non-standard weeks like Thursday through Monday.

Currently, the view as-is is very hard to work with and drag and drop things into the calendar, as it's hard to visualize where I want things to go as it's different than what we use in iCal and Google Calendar.