Heres a very preliminary version of a plugin I started working on a while back. It allows gtkradiant 1.4 to display etpro trickjumplines. Can be used for people who want to tune the jumps on their maps, for example.
Windows:
http://www.collectivecomputing.com/~reed/et/tjlview.zip
Win and linux:
http://www.collectivecomputing.com/~reed/et/tjlview-linux.zip
Note that this is an alpha test release, and the linux .so is barely tested at all, since the only linux systems I have available are headless. Read the included readme for instructions etc.