I hope I'll be able to fix some of these issues at least partly (vehicle camping is already fixed, more or less):
Tank logic: I think this is mostly map pathfinding-related. However, it might also be affected by the .ai behaviour scripts in the AI folder - comparing the 2.2 ones to 2.25 might be worthwhile (see my request below)
Artillery firing at infantry - Not sure about this, I haven't given field artillery much attention so far, since it appears to be impossible to get bots to fire them at long range (whether via the spotting system or via a raised viewpoint) and most artillery guns aren't placed in a position where they get the chance to fire at many short-range targets. I'll have another look at them sooner or later, though. I -have- managed to get the Nebelwerfer to work, though - there was a typo error in the data files which prevented the AI from firing it. I've seen (and heard!) it on Goodwood several times.
The AI can now aim and fire all mortars (there was a bug with the British mortar in 1.1 preventing it from firing) and, in theory at least, should proritise infantry targets.
Vehicle camping: Improved in the current version, bots can now exit from or switch vehicle crew positions. Eventually I'm going to look at getting APCs and trucks to transport troops as they do in vBF2.
Bots will still permanently camp static weapons (which now have a separate AI behaviour group) other than deployables and the fairly useless Bren AA; I don't think this too much of an issue (purely IMO) as it means most guns in strategic positions are permanently manned, with no chance of the bots getting bored and wandering off. And unlike in BF1942, human players can take over from the bots at any time.
Luttich CTD: currently working on this (when I get the chance to); so far I've determined that it's almost certainly caused by a hand weapon, but not the bazooka or Panzerschreck.
A request: If anyone here has FH2.2 installed on their PC, could they upload the .ai files in the \ai folder so I could have a look at them? I'd like to compare them to the FH2.25 files to see what's changed (and see if it's possible to improve the tank behaviour, in particular) but don't want to attempt uninstalling FH2 and reinstalling it again just to get the 2.2 files.