I have a suggestion/idea - a possibility to have an additional/alternative type of altcoin tracking: by manually entering number of altcoins instead of having to define their address. It could be useful if for example you have some altcoin which you want to track but it's scattered on multiple addresses of which some are unknown (be it on exchanges or online wallets or virtual machines or something else) so you'd want to type the number of those particular altcoins instead of trying to track them by various addresses.

Also, some particular addresses might hold coins for more than one person - this is also the case when tracking by address doesn't seem enough.

It could be implemented as additional manually defined entry for any given particular altcoin in addition to "address-based entry".

I understand that ideally no one would ever want to hold anything in any online service but in practice things can sometimes differ.

Another idea is to eventually also add possibility to track properties like aggregated values of stocks/shares/etc. on various crypto stock exchanges or maybe even colored coins/smart properties but that is almost a project in itself.