Drawde got that fixed in the last mod. You might want to check that out. In Beta 1.3B, the nebelwerfer fired short. But in Beta 1.3C, i.e the current one, it fires accurately....
If you are going to reposition planes create spawn AI-only points near vehicles, you might want to consider making planes in maps like Alam Halfa and especially Crete parallel too, since planes sometimes crash into each other on take off.
For spawn points, it might be worth noting mgs at the 88 ridge on Supercharge never getting used i.e the main bunker, the PAK38 at the Sidi Abd el Rahman and that at El Daba (i.e the one in the town facing Gazal Stn).
Frankly, there are actually alot of tactically important vehicles that never get used due to bots never 'seeing' them, like the PAK38s on Sidi Rezegh or the mg positions at Magazin 19.Regimentgefeschistand i.e the underground two story building. (I highly recommend also putting the flag cap area solely underground to make it only infantry cap-pable.)
The Howitzer is pretty innacurate in Totalize and I don't think it will damage gameplay too much if it could fire further than the station. Actually I think it would add alot to cinematics :-)
Small other note, Drawde made vehicle positions for Mobile vehicles like tanks etc such that bots could/would enter and exit, while those for static guns were made fixed so the bots formed static defensive lines with them.... Usually external positions had less preference, making bots more likely to bail from them than driver and mg positions on vehicles. Drawde also changed their destruction time to make it the same as in Conquest i.e Vehicles blow up and remain for a bit longer than they used to in SP, but as long as in CQ, and I think partly damaged vehicles lasted longer before losing their health and blowing up.
Drawde also tried to put many vehicles back from Conquest esp. in El Alamein since it was last coded as SP in 2.0 and so had not been updated. The same fact may exists for other maps. For the AT riflemen though, if it is not possible to get them firing at range in the same fashion as MG gunners, I'd reluctantly say, restore them to stand-firing... But it would once again make PZIIs and light vehicles AT-rifle fodder.
Might also be worth seeing if you can get the 64 version of Bardia and put it in (Done by WinterHilf) it was left out like Alam Halfa. It only had SP and not COOP, another thing you could repair... I will try and post it up on my DL site (Link under SP downloads thread for Alam Halfa)
Sorry for being a nag about all these, I just don't want all the work or some of to be lost if possible. It seems until now, every version of SP takes a few steps foward in some regard, and a few steps back in others, more often more of the latter. Wil try and write a comprehensive post of the issues in the singleplayer Project thread so its all there once and for all...