JumpDest
From the comments in the class source: "Specifies positions that can be reached with greater than normal jump. Forced paths will check for greater than normal jump capability. Note that these have NO relation to JumpPads."
JumpDest's only subclass, JumpSpot, seems to be what you should use for mapping. At least for UT2003, this class appears to just be used to establish code that is inherited by JumpSpot.