First of all.. Well Done! You created a tool that everyone actually need... not what developers want them to need.
Seeing that most merchants or services require 3 confirmations.. I would rather work on 3 confirmations or a option to indicate the amount of confirmations needed to finalize the transfer of the bitcoins.
(Showing that graphically) - A lot like the little Pie graph in Electrum wallet.
Most people in gambling chat options are moaning about deposits being delayed.. so I will be pointing them to this tool in the future. ( A plugin for gambling sites to display deposits or withdrawal status will help with that )
Ps... Also liked your "Balance Checker" option.