Is your feature request related to a problem? Please describe.
I am currently trying to make a weak aura that alerts on death of a player. it is set for:
Type -> Event
Event -> Combat Log
Message Prefix -> Unit Died
Destination In Group -> In Group

While this works for players, it also triggers on pets, and that includes DK Bloodworms

Describe the solution you'd like
The request here is that there be a flag to restrict only to trigger when "UnitIsPlayer" is true

Describe alternatives you've considered
I tried to use
Destination Unit -> Specific Unit
Specific Unit -> party1 party2 party3 party4 party5 raid1 raid2 raid3 raid4 raid5 raid6 raid7 raid8 raid9 raid10 raid11 raid12 raid13 raid14 raid15 raid16 raid17 raid18 raid19 raid20 raid21 raid22 raid23 raid24 raid25 raid26 raid27 raid28 raid29 raid30 raid31 raid32 raid33 raid34 raid35 raid36 raid37 raid38 raid39 raid40

where the separator is " " or "," and both failed. the ability to use a separator for multiple specific units would also work and may be more modular and therefore a better solution.