Hi Night Owl
It doesn't hurt to call and verify the request you have on file.
Anything within the first 3 'beads' from the lobby is "close to lobby" in my book. The walkway to the bus stop is on the south loop within that first bead. Your current request covers both close to lobby and close to bus stop so you should be fine if they have a room in that area available for your dates they'll try to work you in.
As for arriving early and getting the pick of rooms - it really doesn't work that way at any of the Disney resorts. Rooms are assigned about a week in advance of arrival. When they give you your packet you'll be shown it's location on a map. If you don't like the location you can always (politely) ask if there is anything closer to the bus stop or lobby. Then they will call the assigner and ask them to look for you. Reassigning rooms is more complicated than just seeing which rooms are being turned over on the day you check in: they also need to make sure it's available for the full length of your stay and that by changing rooms for your family, they're not causing issues with the other room assignments. This is more easily done during the slow points of the year for the regular hotel rooms, but in
DVC the rooms are fairly full at all times.
I've never had luck with asking so unless I'm assigned a dreaded no-balcony room at Villas at Wilderness Lodge, I just let it be (and Kidani really doesn't have any bad room views anyway)
You'll find plenty to keep you busy at the Kidani and Jambo resorts throughout the day. They have a daily "pool party" for the young and young at heart every afternoon, campfire at night at both Jambo and Kidani. The hot tubs put me into a trance and I seem to loose track of time. If per chance you do get Bored don't forget Downtown Disney is always there and is (to us) fun to walk around in the evening.
I'm pretty sure you'll love Kidani.