1) Like I said before (and Sk3tch), a LED costs nothing ($0.1) and every hardware-store has it..... If you don't want to go to a store, use a led from an old equipment (keyboard/PC/Hell, almost all equipment has a LED.....)
2) Maybe an option in the program to switch between keyboard LEDS and the 'SERIAL-LED'? (BooGhost
)
Then you could even select which LED you want to flash (or all three
)
NumLock, CapsLock, ScrollLock (I prefer this one as the default then, cause the others would be a mess while TyPiNg)....
PS: saralk, yes, that last post was spam