Bind 180 spin to keyboard/mouse in CSGO (controller required)
It should probably be noted you should be able to achieve a much quicker 180 if you have a big enough mouse mat anyway. There might be a way to speed it up within the controller.360.cfg file but I haven't had any luck.
You do need to have a controller plugged in, and you will need to press J at the start of every game for this to work.
bind j "exec controller.360.cfg;"
host_writeconfig
bind q +lookspin
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If you wish to manually 180 but you're running out of room due to low sense, you could try dynamically changing your sens using a bind. Explained by csgoose on Reddit:
/ cgcb3ph