As for the turret dependency for actual gear ... the BelAir has a script for multiple gears whyte rpm-based power. He has a script part saying witch gear witch force multiplier has. Maybe, if you try to change the script into your tank and make the turret rotation speed dependent on the actual gear (whyte their multiplications), it would give such result. Doe, one problem can be there - turret rotation is not dependent on the engine being started, so it would need to fix that little fact (may cause troubles).
Its a little pain in the ass re-scripting but i done it for my Urals, so it does work, you just have to tune the parameters afterwards to make it feel like a panzer ..
P.S.: In the script mentioned above - i added a sound for turning the turret in the name turret.ogg - have just used Murkz´s Luchs turret sound witch i put into the tiger 2 folder and renamed accordingly. You need to do it in order to use the turret. Otherwise OT will give up an error message freezing the vehicle.
Ok got myself to try to integrate the gear/transmission script that Hrrrr and Giucam did last summer with the Tank script that Cameni did for Murkz tank's. I actually choose Hrrrr's version but i could have worked with Giucam as well. So the goal was to integrate the V12 sound set from sonory. I actually edit Hrrrr sound test car to use the V12 instead of the V8 and it sound great as long as the engine stay within 0 and 3000rpm.
Not knowing much about java script, i thought i wouldn't go very far at trying to merge the tiger2 script with Hrrrr's sound test. It actually went better than expected, the tank move
, it could turn if i give a major boost on the engine but then the engine turns at 10000 RPM. There's a whole lot of stuff that dont work as it should (like the turret doesn't turn) but if anybody think they have the knowlege to tweak the script, you could install that buggy version of the Tiger2 and see what you can do. Probably you will have to backup the original version cause it will probably overwrite it.
https://drive.google.com/file/d/0B96RrTcNJsI2M21seXNvenlGTE0/edit?usp=sharing...and then we could try to make the turret turn at varying speed depending on the engine rpm