My guess is that external camera has been enabled only for sea units in SH4 because of the camera bug for land units in SH3.
My other guess is that might be hidden in .ACT files. Provided the corresponding section is found, one can compare it with that of SH3 using hex-editor and maybe bring back the possiblity to fix the external camera on planes, etc.
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Serg's SH4 and SH3 pages
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