Count to 5 and kill the game with a whistle - easier to explain that clock not started rather than cancel a basket on a 'after whistle' play.
I would always give an extra second on a display that does not display 0.1 seconds; in fact I would probably give it anyway just to make sure
, sometimes I may count a little quick...
When I was [more of] a newbie, an experienced guy said that we are human and make mistakes and so do the table officials on occasion - we are a team and have to work together; to this end he always counted anything less than 8' in a quarter just to be safe, also useful if equipment is a little 'interesting' for the home team.
It is only the same as a count for the 8 seconds and then having the display show '20' after you blow the whistle, the display is to help but the referee's are responsible and carry the can if it is wrong.
My 2 pence worth anyway (or is that 3 cents now?)