I wouldn't bother putting it in neutral when shifting between d and r. I wouldn't do shift between the 2 while moving though.
I couldn't tell you if there's an inhibit to lock out reverse. There may be something that'll stop it from shifting into reverse while doing 70mph but I'm not going to be the one to try that out. Could always get a rental and give it a try?
Mirage videos:
__________________________________________
View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)