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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff, The Tao of Pooh
Personally I liked Shantalya's version of filger best if anything for the config layout. The copy I still hold doesn't work anymore though which makes me sad, and the tukui fan update just isn't the same.
rFilter3 is a good replacement though the config layout is a bit more complex. Though the addon itself is vastly more flexible.
I've used rFilter3 for a while in the past, but I really missed the animation that occurred with Filger when a specified ability came off cooldown (kind of like Doom Cooldown Pulse). I'll try iFilger, or just try and tweak rFilter3 again. It's been a looong time since I've played, so this may take a while!