Oh dear, poor Lex clearly doesn't watch enough war films.... never volunteer, always take a step back. Looks like you get to poke the person who wrote the rule and make him/her/it explain what they meant 
Not volunteering...
I am/was part of the review..... hence my earlier point on generic vs special rules. But I stand corrected by Guthwine: both the rules for Steamtank AND cannon are
in effect special rules and thus both apply. Mind you the review on this bit was some time ago...
One note on the rulebook, and a point of some contention when doing the review, is that the writing-style of the book tends to "merge" fluff in with rules, which often leads to potential misinterpretation. We did discuss cleaning up those areas with Rick at the time, but sadly with the restructuring of GW and his subsequent departure, never got around to take out those ambivalent paragraphs.
The best I can offer right now would be to dedicate part of the forum to "answer" these questions, but the simple fact is that time and again we get told that "it aint official if GW dont print it", so the best we can manage here is to have a "community rule" (as a houserule, but for a larger meta-environment)
