Crowdsale contract and safe withdrawals

Crowdsale contract and safe withdrawals

According to crowdsale contract at https://www.ethereum.org/crowdsale tokens are transferred to a user account when "function () payable" is called by using external function tokenReward.transfer(msg.sender, amount / price). Nevertheless when user 
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Overriding ERC-20 methods

Overriding ERC-20 methods

It seems clear that you can override the ERC-20 methods (transfer, etc) to have them do non-standard things in addition to the intended functionality.
Is it true that as long as you 
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