Shiva Directive (second part of In Death Ground) is currently being worked on by White & Webber (no idea what the latest projected release is).
The entire series is based on Starfire as Webber was in charge of the line at Task Force Games. He was involved with 2nd and 3rd edition I think. There are supplements for 3rd edition based on all of the novels in the series. 4th edition (Galactic Starfire) is now available and, so far, seems to be a big improvement. If you're interested in strategic space "board" games (with tactical combat), I recommend checking out Galactic Starfire (
http://www.starfiredesign.com/).
As far as SE4 goes, I've started (barely) working on a complete rework of the tech to match GSF (not too bad as it has tech trees, but research works differently). A mod could definitely be done based on the novel series -- I'd recommend finding a copy of Starfire (3rd or 3rd Revised is closest to the books, but is missing some of the tech (available in the various supplements) while 4th has virtually all the tech already in tech trees (missing high TL items from Insurrection)).
[This message has been edited by wilcoxon (edited 06 March 2001).]