Welcome abour Ezer!
As for the first question - I will be honest and admit I am not real clear on what your asking - so I can't answer.
However, on the second - getting a flat trajectory for the shells is easy - edit the shell speed to be extreme. This was done with an old mod called "Killersub" though that mod also made a one shot one kill change on the shell damage. The faster the shell goes, the less arc it needs. Increase the speed dramatically and the shell doens't need an arc at all. Killersub has not been updated in a long while, or else I would suggest you use it to see the changes it made.
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Good Hunting!
Captain Haplo
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