The reason that not all turrets work with the mouse is that there are now two controls per turret if the turret supports both functions:
1) The mouse moves the gun within the confines of its movement range.
2) The alternative controls move the gun mount. This can be either the adjustable window on the Stuka, the gun mount assembly on the He111's top turret or the entire turret in the case of the Blenheim.
3) The exception are gun installations where only one function is present (eg, a powered turret where the gun is bolted down onto the turret, like in the Br.20 top turret, in this case there's only one thing you can move). In that case, the function defaults to the mouse.
By default, when i first installed the sim my no.2 function (gun mount movement) was mapped to the joystick which conflicted with the flight controls, so i remapped them to keyboard.
The problem as correctly pointed out is that the gun mount controls respond slowly.
Also, in some cases it would make sense to reverse them, or at least have a toggle for it and a "toggle while button held" function. This would be similar to how it works for changing between mouselook and mouse cursor/clickable cockpit: we either press F10 to switch it on/off, or we can fly with the cursor always enabled and hold middle mouse button while moving the mouse to use mouse look temporarily.
The prime problem here is the Blenheim turret because the gun has a small range of motion within the turret, independent from the turret's movement. So, following the above control logic/convention, the mouse moves the gun up/down (good), the mouse also moves the gun left/right until it reaches the stops of the turret window (not that useful because the range of motion is way small) and the alternate function (the laggy one) is mapped to turret movement, making it hard to aim.
It works the same way for the top turret in the He111, but in that one both the gun mount and the gun have a lot of swivel range and you can get it where you want it without issue.
If we had a similar system to the one used for alternating between mouselook and clickable cockpit, we could do it all with the mouse. Let's say i map the "toggle function while held" button to one of my mouse buttons at the side of the mouse:
1) Moving the mouse would move the gun.
2) Moving the mouse while holding the side mouse button would move the gun mount/turret.
This would give full analog control to both functions without taking up extra keyboard commands and be sufficiently intuitive to be useful in combat.
There's a high probability this is already possible, because the sim control options do support modifier keys: you can have an axis mapped to throttle, but button + the same axis can be mapped to prop pitch. In that sense, maybe it's possible to map mouse button 4 + mouse movement to the turret/gun mount controls.
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