A fastener-driving tool including a trigger control mechanism operable in a sequential actuation mode and a contact actuation mode, said tool comprising: a housing including a combustion chamber and a lockout device; a workpiece contact element movably connected to said housing, said workpiece contact element being movable between a rest position and an activated position; a trigger movably connected to said housing; and a processor associated with said housing, wherein said processor is configured to cause an initial combustion in said combustion chamber and cause the tool to operate in the sequential actuation mode to cause a fastener to be driven into a first location on the workpiece when said workpiece contact element is pressed against the workpiece thereby moving said workpiece contact element to said activated position, and when the trigger is moved from a rest position to an activated position; wherein said processor is configured to cause the tool to operate in the contact actuation mode to drive at least one additional fastener into a second location on the workpiece when said trigger is held in said pressed position and said workpiece contact element is pressed against the workpiece, characterized by an actuation lever movably connected to said trigger; a trigger assembly including a stem, said stem being movable between a rest position and an activated position, wherein in the sequential actuation mode said trigger, when it is moved to a pressed position, causing said actuation lever to move said stem to said activated position; and wherein in the contact actuation mode the workpiece contact element, when it is pressed against the workpiece, causing said actuation lever to contact and move said stem to said activated position, wherein in the contact actuation mode in which the trigger remains in the trigger activated position following fastener driving when the fastener-driving tool is in the sequential actuation mode, the processor further activating the lockout device keeping the combustion chamber closed not requiring further activation for combustion. a housing including a combustion chamber and a lockout device; a workpiece contact element movably connected to said housing, said workpiece contact element being movable between a rest position and an activated position; a trigger movably connected to said housing; and a processor associated with said housing, wherein said processor is configured to cause an initial combustion in said combustion chamber and cause the tool to operate in the sequential actuation mode to cause a fastener to be driven into a first location on the workpiece when said workpiece contact element is pressed against the workpiece thereby moving said workpiece contact element to said activated position, and when the trigger is moved from a rest position to an activated position; wherein said processor is configured to cause the tool to operate in the contact actuation mode to drive at least one additional fastener into a second location on the workpiece when said trigger is held in said pressed position and said workpiece contact element is pressed against the workpiece, characterized by an actuation lever movably connected to said trigger; a trigger assembly including a stem, said stem being movable between a rest position and an activated position, wherein in the sequential actuation mode said trigger, when it is moved to a pressed position, causing said actuation lever to move said stem to said activated position; and wherein in the contact actuation mode the workpiece contact element, when it is pressed against the workpiece, causing said actuation lever to contact and move said stem to said activated position, wherein in the contact actuation mode in which the trigger remains in the trigger activated position following fastener driving when the fastener-driving tool is in the sequential actuation mode, the processor further activating the lockout device keeping the combustion chamber closed not requiring further activation for combustion.