one question, would a user if it was UI based not able to spam using another interface ?
what is the problem with the micro spamming, does it all "cost" us something (i.e server costs, bandwith, etc. )
are some users getting huge amount of spam, that there wallet is bascially a mess?
I'm only suggesting a "Minimum $ threshold for being notified of transactions"
What is the problem, you ask ...
Why would we tolerate even one user spamming everyone else with 0.001SBD ?