pavroo: thanks for your patient and quick response. When I attempt the above, Custom Startup Services will not accept the "=1" at the end of the command.
and what gets entered is
I broke down and RTFM'd a bit, and opened up /home/myusername/.config/autostart in Leafpad, and found:
I added "=1" to Exec=synclient TapButton1, saved and rebooted, and everything works properly. But when I open Sparky Center/Custom Autostart, the =1 still does not show in that line in the window. Could there be a number-of-digits mask somewhere that isn't big enough for this command? Or
I also inadvertantly added an additional null line in the Custom Autostart window that will not go away with the "delete line" command.
But right now, I'm pretty happy with Sparky on this machine. Thanks for all your hard work!