Reduction in number

I've a planning to keep my cars because of the differences between driving trains.

*Frontal engine and rear driving:

SXE-10 TOYOTA Alteza(Being used by my wife)

*Frontal engine and frontal driving:

XH200 Opel B-Vectra

EP-82 TOYOTA Starlet

NCP-10 TOYOTA Vitz

*Frontal engine and all wheel driving:

BC-7 SUBARU Legacy LSi

BE-BLE SUBARU B4 3L(Being used by my son)

*Rear engine and rear driving:

AD-11 Volks Wagen Super Beetle

Now I'm obliged to reduce my cars in number because I can drive only one automobile at the same time.

Some professional engineer specialized in automobile trans-axle mechanisms has come to talk about very professional districted region of research of Control Mechanism, System sensitivity, Robust Control! How come ? Is he crazy? It's merely on a YaHoo Forum site?