There are many ways to do the mod MP thingy.
Anyway I fully agree with Norb, this is one of the most productive communities I ever saw with modding. Scenarios, maps, sprites&textures and of course, weapon mods... lots of goodies we will see I am sure and in greater numbers than I saw in Tc2M.
Most certainly, a modder can fix the arty to some extent by altering the files (lots of tests will be needed) but I urge you to consider, Norb, (in view of future developments) the possibility of the extra tables I mentioned. This would really allow modders to even build new units which can then be targeted: Couriers, Generals, Supply wagons, Buildings, Gatling guns, Horse Artillery, Pontoneers, Indians, Aides de camp... and the Signal Corps that did not pass unnoticed in another thread.
The point is that if the problem with the arty is related to accuracy, "fixing" shrapnel and Shell will increase the accuracy of Solid as well.
That translates into a ahistorical kill rate for solid in long range whereas the problem of long rng accuracy was really the reason why Shrapnel and Shell were used for long range targeting.
I don't know how you're going to move on this specific path but I am confident everything will keep improving.
