> By the way, after reading code of mmt macro, I have found an *ugly* way > to disable this feature, disabling macro )k that generates the output of > two short bars. The problem is many other macros use )k, I don't know > what other feature will be broken by doing this. Could you please tell > me a correct method?
This macro does nothing *except* draw the cut marks, and it is called only from a few places. Since it has no intended side effects, replacing it with an empty macro is indeed a "correct" solution. If you're worried about messing up the spacing, then you should simply replace the ".tl" line with one that doesn't draw anything: .tl ''''