In IDPA you may not move or reload with a finger in the trigger guard, except when actually firing on the move as is sometimes called for.
A shout of FINGER! from the safety officer is a warning that you are so acting and must immediately get your finger out of the guard.
Failure to promptly comply will draw a 3 second procedural penalty and disqualification on repeat offenses.
USPSA has the 180 degree rule, IDPA has "muzzle safe points" that your line of fire must stay in front of.
A shout of MUZZLE! from the safety officer is a warning that you are approaching the muzzle safe point and must direct your gun downrange.
Allowing the line of fire to cross the muzzle safe point, even if no shot is fired, will result in disqualification.
A 9mm 1911 is an Enhanced Service Pistol. I think the division was originally envisioned in 1996 as a home for obsolete single stack .38 Super IPSC guns, but 9mm ammunition is cheaper.
You are accustomed to the raked grip of the Pardini, you might look at a Glock with the Cominoli add-on thumb safety.
http://cominolli.com/product_info.php?cPath=22&products_id=29&osCsid=su7qt9nsje7ecs3nqd4cgat860
Or just shoot a Glock and keep the 5906 as your house gun... once you have determined you will stay with IDPA enough to warrant buying a new gun.