Now I'm no way near an authority on the subject, but surely WG can introduce a Commonwealth Tech Tree on console to bring in some very interesting tanks into the game and to promote some of the smaller tanking nations.
For the Aussies, a possible tech tree could look like this:
Bren Carrier LP2, M11/39 (Italian)
M3 Stuart, Crusader Mk II, Renault R35s, M14/41 (Italian)
Matilda IICS, Valentine MkVCS, AC1 Sentinel, M3 Lee/Grant
AC3 Thunderbolt, Churchill Mk IV (A22)
AC4 (Currently a Premiun Tank in the PC version of the game!!!), Cruiser MkVI
Centurian Mk III
Centurian Mk 5/1
This is just a suggested structure, if you think the tanks are in the wrong Tiers then please post your suggestions! Hopefully WG might take notice of this thread and give us Aussies something to really work at.
PS WG already have a 'captured and converted' tank in the game. The Premium T34-88 (a captured soviet tank which the Germans put an 88mm gun on!!).