Would it be possible for acacia trees to be planted with success in the bush? Im thinking of getting 100 acacia acuminata and simplicifolia seeds and driving into the bush to plant them somewhere.
What would be the ideal terrain for these species?

i would think the best way to get things going is to germinate the seeds yourself, and transplant the seedlings throughout the wild.

^ yep.

A hundred seeds are not that many, and unless you found the perfect spot in the right season, they might result in very little. But if you germinate them yourself, you will get much higher rates much sooner, and then going and planting established seedlings in a good place might start a propagation spot.

Of course then you should start them in similar environment conditions to the destination, and it means some work and space... but sounds much more efficient in order to become Johnny Acaciaseed. Otherwise you would need a bag full of them

I have pondered this, though it has crossed my mind whether there may be negative impacts to ecosystems and the native flora that grow in them

anyone?

At a large scale of spreading, or in the long run, yes, there may be impacts.

First of all you should answer a question - why would you sow seeds in the wild? If it was solely in order to increase the availability of the plant, then you might care that the seeds will thrive and nothing else, but at the expense of an ecosystem.

If what you want is to help the plant integrate in a new area, or to re-establish it in an area from where it disappeared, then you have to consider many things. First, seeing if the environment fits the plant's needs, and second, finding out the chances for the species to be invasive. And that's completely relative, a species that might act as invasive in one area will find an available niche in another.

Acacias are a prosperous and old group, they are tough and they know how to thrive. In South Africa they have used seed-eating insects to control the spread of a few australian acacias.

If you know what you're doing, spreading seeds or plants in the wild sounds like a good thing. But if the idea is sustainability in the long run, growing yourself is the way to go imo. Acacias will do fine in the wild, as long as people does not kill them.

That answered my question perfectly, thanks for the replies.
The local ecology has to be considered first and foremost it would be very reckless and downright wrong to damage or destroy an native ecosystem just for the sake of creating a source for ones self.