>..A much
>more sensible solution would be to introduce a small oil pressure pump
>(manual or electrical) which can supply oil pressure before the engine is
>started. This will reduce wear much more than any warm-up.

 On my Lotus, I installed a Accusump. This is an accumulator that
'stores' pressurized oil. There is a valve (electric or manual) that
closes when the engine is shut down, keeping a quart or three of oil
(depending on the size of the unit) under pressure.
When you restart, the valve is breifly opened, allowing full oil pressure
before even cranking the engine over.
It also prevents oil starvation during hard cornering- if the pressure
lowers, the accusump 'kicks in' and keeps the pressure stable (until it
runs out).

 Mark