Interesting discussion.... my only advise is keep a written record of the reason for buying and sell for each share purchase undertaken.
For investing perhaps hold the share in your individual name and if trading perhaps use another entity. (ie Company) If you wish to trade and invest in your own name at the same time then have separate bank accounts for each and a different broker (ie use ASB for trading and Direct Broking for investing). The most important issue is to be able to support the activities that you are undertaking: trading or investing or both...