I'm with Jonathan on this one. For me it would very handy if I could exclude (or possibly include only) several accounts from a dataset.

Even making the "Filter by Account" field a multi-select like "Filter by Categories" would be an improvement. My use-case is to get a year-to-date picture of NON-INVESTMENT income and expenses; I have few enough active accounts that it wouldn't be too tedious to list either the ones I want included or the ones that shouldn't be included, but limiting the query to just a single account isn't enough.

Especially it would be very useful to exclude tags. For example, I'm adding tag "vacation" to all transactions which I created when I'm travel on vacation and I want to Analyze month without these transactions