So you are thinking you can do a midpoint trade of half of one...

So you are thinking you can do a midpoint trade of half of one tenth of 1 cent ie $0.0005?
I thought teh min on market was $0.001 ( ie 1 tenth of one cent)
I don't think it can be done on market but I may be wrong so you would have to check with broker not online broker. . Off market it can be done at 1 cent total for any number of shares so it is possible as that is min legal tender and possibly a hangover of min nominal value stamp duty could be charged on in the old days he old days min duty. As a special it may be possible but it has to be in market range in theory .

I'm no longer up to date with exact rules. I'd be interested if you do get a clear answer just to update my knowledge or a reference to where that info is. these days on ASX site / listing / trading rules