Left4Dead2 Visuals Multihack

thats how backtack is going to work in l4d2
https://i.imgur.com/Pas4rqI.mp4

in singleplayer in must be used with net_fakeping command on any value like 1
online, its recommended to have around 200-400 with fakeping

the visuals should get longer the more ping we have but i didnt fully understand something if its being done manually or automatically because i havnt seen it being done automatically by now, but it should be improved in the future

I understand how it works basically with the video (like it only works with fakeping), but I'm not sure what value should I uses or should I check the Only ping box, or should I use interpolation only or extrapolation only or both etc... And is it detectable or suspcious? Can you recommend the values and explain it a little bit more.