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TMG list the oil cooler as optional. I this running a thicker oil is the way forward. TRD japan also recommend a heavier oil.
Cirtainly a 10W60 will keep pressures up!! It might be okay for me to use a 10W40 as my car is garaged and generally comes out with oil temps greater than 0C.
The oil pump is fixed flow (except when pressure relief is open). Pressure is determined by resistance in the system. More resistant (for example smaller bearing clearances) with give more pressure but the pump will guarantee flow unless the relief valve is active.
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