Well, since you do mention "Stock"... you cannot go wrong with Webster's Game Fixes Only mod, but done up the way THEBERBSTER envisioned. The first post of his "Beginner's Mod List For SH4 Including Download Link" is the place to go for
http://www.subsim.com/radioroom/showthread.php?p=2508558#post2508558. You play that with manual targeting, and I think you'll have the quickest, easiest set-up, and good gameplay also. AKA: GFO (Game Fixes Only), is a collection of little mods, mostly from Webster, that address a bunch of little niggly problems with the game. Read Webster's documentation, and you'll see what all he addressed. THEBERBSTER still kept the options that Webster has in the original package, but now they're set-up in the MODS folder for your use, if you so desire, just so long as you follow THEBERBSTER's instructions in that thread...