I think that the main reason why cars don't have manual transmission coolers is that they are generally not needed. Manual transmissions are a good deal more efficient that automatic transmissions, and don't produce nearly as much waste heat. So for most purposes, just dissipating the generated heat through the case is good enough.
I should mention that it may be possible to set up a manual transmission cooler fairly easy on an older Honda. The 1990-1993 Intgra transmissions actually employ an oil pump to generate oil pressure in order to control the speed sensitive power steering. This oil pump is located on the speedometer cable pickup, and, on a non-power steering equipped car, could be set up to pump oil. This oil pump could pump oil between the fill and drain plugs, and through a cooler and filter. And there is a chance that this pump could be installed on any Honda cable transmission. But it wold not be possible to use it on a newer Honda, as these cars use an electronic speed sensor o the transmission.
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