... The higher the DEX the further and higher you can jump so jump from the middle of the platforms. ...
Actually this is not true. Your jump gets a one time boost after a certain story event but this is completely independant of stats or skills. The jump is the same for everyone.
Never really paid attention, just noticed after I bumped up my DEX my char was jumping like a rabbit compared to the starting jump where she couldn't even jump a cross the tiny streams in Broken Valley Village =/
We should really have more control over jumping if it is going to be such a monumental part of the game. (Completing quest)