Choice 2 is a pretty bad idea. In fact, if the devs included it, they could reasonably be accused of theft.
The rules are:
It is smaller than 10 thousand bytes.
All outputs are 0.01 BTC or larger.
Its priority is large enough (see the Technical Info section below)
So, the wallet would need to have at least 0.01 in dust.
I would suggest changing "All outputs are 0.01BTC or larger" to "All outputs are 0.01BTC or larger, or it has 1 output and at least 5 inputs".
Tidying up dust would be encouraged.
The priority of a transaction is
1 BTC: 1 day
0.1 BTC: 10 days
0.001 BTC: 1000 days
Transactions that merge dust into a single coin aren't given much incentive.
On problem is that if you make tidying up dust easier, you also decrease the incentive to not create dust in the first place.