This is something i know quite alot about, because of the nature of what i do in sl i use this feature quite alot, i have found it on most of the frequently used viewers excluding official SL viewer, Phoenix is Advanced-Debug Settings-PhoenixIgnoreFinishAnimation set to TRUE default is FALSE meaning there's a delay when you land, Firestorm is same route just FSIgnoreFinishAnimation Singularity is same route and type Nimble set to TRUE or using the drop down at the top of the screen and select Nimble inside the one named Singularity. Stopping this delay because of these events will enable you to from whatever height be able to keep moving when you hit the ground, there is no "splat animation" which you get from high landings and no delay, the jumping is true also it is possible to double jump. I hope you find this usefull