Dynamic Lighting focal point(s)?

I've been watching a number of videos where the GM has access to dynamic lighting and uses it. It looks really quite impressive, but I have a concern about line of sight in D&D 5th edition that seems to trip up many players ability to see with dynamic lighting. Yes, a GM can use ctrl+L on a token to see the lighting from that token's perspective, but... Line of sight in 4th and 5th edition is based on the fact that a character is mobile inside that whole 5' by 5' zone. When determining cover (or sight) the attacker can use any of the 4 points/corners of thier space to draw a line to the 4 points of a space occupied by the target. (That language is specific because large creatures that take up 10' by 10', can be halfway behind a wall, yet you still get a full shot on them.) An attacker can use the most optimal point to draw lines to the 4 points/corners of the target's square. Half-cover is when you draw a line from your good corner to 2 or 3 corners of their corners unobstructed. 3/4 cover is when you can only draw a line to one of their corners. Why do I think dynamic lighting doesn't work right? because it seems in the videos that i've seen that each token, only get's one point to begin their sight line. That point is the center of their token, when it should be the 4 corners of their square. Yes... this causes issues when the grid system is not used by the GM (for a number of legitimate reasons). But I think it's fair to require snap-to-grid for dynamic lighting (or as an option in the map/page features) -Mav

As somewhat of a workaround, you could add an additional 2.5 feet to the radius of any light source/vision to approximate measuring from each corner of a medium-sized creature's space. Add larger amounts for larger creatures, though the larger the creature, the more significantly larger field of vision than they would normally have. Alternatively, you can use the ruler tool to measure directly from corners.

I think what he is getting at is that he wants to be able to see what a token could see from any corner. Really, the easy work around for this is that the player or GM can simply move the token so that it's center is on whichever corner is of interest (you can use alt-drag if only update on drop is active).