There should be no harm in leaving a flashcart in your DS at all times. I have ZERO real DS games, so my CycloDS (and before that, the R4) is ALWAYS in there.
While I do own a few actual GBA carts, I have a flashcart in that slot also. Never had a problem and my DSlite is an original first batch USA release black DSlite.
That's almost exactly the same as my situation
Except I don't have the first batch USA black DSlite
And I use an Acekard 2 and used to have a DSTT
QUOTE(Raika @ Oct 13 2008, 08:57 PM) i take my flashcart out of my ds often to be a 'time traveler' since i cant set the date on my r4 if you know what i mean