Hi CM - re missed limit orders,
Recall that your broker will fill limit orders as he is able in the order received. So, if you have a low volume stock that may trigger a buy or sell, the sooner you place the limit order, the better. Also, there's no reason why you can't let the current day (with its missed order) lap over into the next day. On the day following the missed order, place a one-day sell limit order for 30 sh at $4.87 and another for 40 sh at $4.95 in that order. This would preserve the "works" of X_DEV, as a remedy to the missed sale.
hth, Tim