Something else I suggested weeks back.  Have a password parameter such as "t=0.01" to set a payment threshold of 0.01 BTC.  Take the lowest received value of that parameter as the valid threshold.  This way, a bad actor could cause a payout to occur before the user wished but there is no way to delay the payout.  If no bad actor is involved then the user has control of when their payout occurs.

I typically get one payout per day.  I'm afraid of what the transaction fee is going to look like when I finally collect all this dust and try to spend it.