Question: do you use any published tables to assist in making rumor creation - or is it all homemade or adhoc?
Both. It depended on whether the rumor was "small-R" or "big-R".
As I wrote before, the small/big designation depended on the rumor's overall importance. If it was a plot point or piece of critical information, it was "big". All the rest were "small" and used to set the scene, produce some uncertainty and/or surprises, provide the crucial
"We're Not In Kansas" feeling, etc. Sometimes I promoted "small" rumors to "big" depending on how the plot/campaign progressed. That's why I tracked the "who, where, & when" associated with rumors.
The "big-R" rumors were all "handcrafted". I'd write them specifically, link them with a specific source or sources, and place them at a specific location or locations. The "small-R" stuff was pure slush pile material. I'd crib them from published adventures from both
Traveller and other RPGs then file the serial numbers off. I'd write up a dozen or so by using the one paragraph news briefs found in most papers. I even made up 2D6 tables to help me mix & match 2, 3, or even 4 elements together.
Once I had a heap of them, I'd roughly sort them into topic piles. The biggest pile was usual tagged "general" however. Then, when a rumor was needed, I'd simply pluck a card out of a likely pile and play it from there. I very rarely used
GDW's 2D6 matrix method and associated the
"Scouts get a +1 on the red die, merchants a +1 on the white die, etc" DRMs. I tried it a few times but found it more of a bother to set up than it was worth.
I worked to make "small-R" rumors somewhat generic so I could customize them on the spot for whichever PC developed them. Using the corrupt orbital fuel boss example from my last post, I'd spin it differently for an ex-merchant getting it from a fellow free trader,
"They're always grinding a credit from us. Did you here about what's going at the Conway highport?", than an ex-scout getting it from someone vaguely official,
"Watch it at Conway. There's an investigation brewing regarding fuel assignments and you don't want your name linked to it.".
There's a piece of software called TableSmith or some such floating around the 'net. IIRC, there's a Yahoo Group for it. I remember trying it out and thinking just how easily I could have cranked out hundreds of "small-R" rumors using it.
One final note, like Sabredog I had an outline of the plot and subplots and they would go even if the players never stumbled across them. On certain things the clock kept ticking whether the players were aware of it or not.