To draw a customize vertical line with different style is a very popular indicator in metatrader software. It'll help many traders to spot the range quickly.
For details example about usages...
Custom time settings also good. For example, if one tries to figure out nifty movement after europian market opening to the squareoff time about 3:15. Can draw two different color vertical lines to separate the range. Or some one may be interested to mark MCX crude movenent in evening hours like 6pm-9:30pm with different vertical lines..
Just look below. It is one of the popular indicators - I am using such separators for hourly, 4hourly also on smaller TF..
https://www.mql5.com/en/code/10724
More options are always better.
For now, just a dashed vertical line with different colour to separate day & week range would help many traders to spot the range very quickly.