Ah the joys of ambiguous rules

Ok since one of the more reliable people haven't answered yet, heres the run down as I see it.
Grenades have a firing mode listed somewhere in the description.
Some, like the standard MI frag grenades have (Excuse the caps Im too lazy for italics) UNDERSLUNG, which means they're fired direct basically.
Others like the Plasma grenade have THROWN which is the indirect fire mode with a range off, I believe 6 inches.
The scatter rules seem to be in place for grenades thrown this way as per the rules, but I've always assumed its some kind of editing error (Of which there are many

), I think (though again without my book here I could be wrong) that in the flight section theres some different scattering rules which make a lot more sense for grenades, but you're reallygonna need to agree on some kind of house rule unless you want grenades only scattering backwards and forwards and possibly way further than you threw them.
Um.... I think they both need a ready to use... but Im really not sure, in practice most of the grenades are a bit pap appart from the gas grenade (Which is removed from the list in the MI army book) and the plasma (Which can also be placed or fired as a javlin round).
Sorry if that description is somewhat less than usefull. Somewhere in the frount of the book is a header titled fire modes and I think throwen has a little sidebar or something which should explain it.... about as well as I have here lol