I have been looking for this exact mod, but for cars.... to no avail. For 2 years. I've searched up and down most mod databases, made threads on multiple forums... it doesn't seem like there's a way to change the way the camera resets like that or at least no one has yet AFAIK.
The only thing I've found is the first person mod. http://www.gta4-mods.com/script/firs...-mod-v11-f2635
It does what you've asked, but only while in first person mode. To get it to do that though (keep the camera where you aimed), you will have to open the .ini and change the values to: AutoCenterLR = 0 AutoCenterUD = 0