Phex doesn't need any more Java Software than LimeWire.
Just install the Java Runtime Environment (JRE, 7 MB), not
the entire JDK. The JDK is for writing Java programs, the
JRE is all you need for using them.

PS: What exactly will LimeWire 1.5 do ? Research for a file ? Handle a dynamic list of download sources ? Download the way Phex or Gnucleus do ?

PPS: If LimeWire's grouping feature is for resuming Smart Downloads, why does it actually group by name and not by size ? you cannot resume from a file that has a different size!