Is your feature request related to a problem? Please describe:

Not a problem, but I'd only like my watchlist buffs to glow in pandemic window, i.e less than 3 seconds

Describe the solution you'd like to see implemented:

Number input next to Glow checkbox if checked, where i can enter pandemic window number i.e 3 seconds. Icon would only glow if that condition is meant

Describe alternatives you've considered:

different addon maybe?

Correct me if I'm wrong, but doesn't that option already exist? I'm pretty sure I added that feature. Or am I misunderstanding?

Look for "Glow at Countdown Time" which has the description:
"The amount of time (in seconds) remaining on the buff or debuff countdown before the glowing starts"