We were looking over old posts and just for anyone who is interested in providing tooltips for span indicators, here is our recommended way using the current version.
Handle the TokenMouseHover event and in that make a call GetSpanIndicatorsForOffset to get the span indicators at the token offset passed by the event arguments.
So something like this would give you an array of span indicators at the token's start offset:
SpanIndicator indicators =
From that you can see if there are any that should display a tooltip and if so, return the appropriate tooltip text.