If you want to spend "dust" then unfortunately you have to pay more fees to do so (otherwise the network would just get drowned in such txs).
Not quite dust. More like using singles to pay $100.
If time is not of essence these small inputs sitting in people's wallets should just be allowed to age and then consolidated using a low-fee, low-priority transaction. We did this all the time in the old days but it seems like many users today don't even know how.
There should be a button in the client. I don't think there is.