My questions are:

1. Could my frog room be too humid, causing a difficultly in keeping darts/pacs comfortable? - The ambient room humidity plays little part in a Dart frogs vivarium humidity. Dart frog tanks have solid glass tops so the humidity is more controlled by how often you mist the tank

2. With the temps listed for our home and/or frog room cause issues trying to keep a dart/pacs heated? Darts need to be kept in the mid 70s. Anything over 80 can be lethal and below 68 can be lethal quickly for some Darts

3. Is the high humidity a blessing in disguise? - See 1

4. I guess I'm really asking, can room climate majorly affect habitat climate? Or is it not that big of a deal? - The Ambient room temp will make it harder to keep the internal tank temps up. It is not impossible, but you would want to setup a tank and then figure out what you will need to do to keep the temps and humidity in the proper range before you purchase a frog and house it in there.