It has been some time since playing HL2. I'm not sure you can make it use the mouse, as the mouse controls where you are looking in the car (even though you don't need to look around) So unless there is a mod or other kind of program to use. I don't think so. It is just a unfortunate downside of HL2 a lot of people disliked the vehicle controls and they never changed it
Thanks,
Phill3990
My Computer
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PC/Desktop
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Custom Build
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Windows 7 Home Premium x64
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Intel(R) Core(TM) i5-4670k CPU @ 3.40 GHz, 4 Cores
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MSI Z87 - G45 Gaming ATX Motherboard
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ACER S236HL 23" HDMI Monitor
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Zalman Z11 PLUS Midi Tower Case
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Cooler Master Hyper 212 EVO (120mm) CPU Cooling, 5x Case Fan