In Queensland, both the settlement period and the deposit amount can be negotiated with the seller prior to signing the contract.
The terms of a contract are up for negotiation and is a very powerful tool for a purchaser. The highest price does not necessarily clinch the contract.
Offering a higher deposit can make your offer more appealing to a vendor as it reinforces that the buyer is serious about the offer.
The settlement period is also an important consideration. A vendor may prefer a short settlement or a longer settlement depending on their own needs. Meeting the vendor needs may put you well ahead of other offers. Speak with the sales agent about vendor preferred settlement timeframes.