Add a Angry Assignments like feature, utilizing #59 and BigWigs custom notes feature (BigWigsMods/BigWigs#140).

Imagine a UI that has the following flow:

Create new assignments
=> Select a boss fight template, data from BigWigs, could look like this:

Boss: Archimonde v3
Big Spell of Doom 
#1 
#2 
#3 

Another super doomy Spell
#1 
#2 
#3 

=> Raid lead fills in the blanks
=> BigWigs hooks into it to display the name of the assigned person as a note behind the spell name in the bar.

or use no template at all.

BigWigs templates could have a lot of meta-data that is useful when creating assignments, also by making assignments smarter than just text, the display of it could be filtered to only show information relevant to the player if wanted. Actually requires BigWigsMods/BigWigs#139 to be a thing as well.