Yes, the Newquay area would definitely offer opportunities for a much greater variety of traffic. Had the Padstow branch survived into the seventies there is a small chance that Padstow could have become a south-western version of Kyle of Lochalsh, but it’s probably unlikely as there wouldn’t have been the same volume of fish traffic and although like Kyle Padstow is relatively remote from major centres of population, it is still very close to a busy main line. It is the remoteness of Kyle and Mallaig that ensured the relative longevity of the continuation of freight.
But a layout based on Padstow, but modelled with the traffic seen on the Kyle line up to the 1980s with short loco-hauled passenger and freight trains, with the odd mixed train perhaps would be interesting.
Depending on the era, substitute the Scottish class 25, 26, 27 and 37s with WR 25s, 31s and SR 33s and a very interesting layout could be enjoyed, with plenty of shunting running round etc.