Update:
Last Tuesday (May 9) I emailed
guest.services@disnseyworld.com about this issue.
On Sunday (May 14) I got a voice mail requesting I return their call (direct number) about this issue. I was able to speak to him yesterday. He said the reason he took so many days to get back to me was so that he could research the details on the rules to determine the number of days you can make FP reservations. According to him:
The number of days for which you can make FP reservations has two limitations.
1. The number of days for which you have tickets is the max number of days
2. The max number of days you can make FP reservations is the LARGEST of the following three criteria:
a. The days you are booked for a WDW resort
b. The number of days of the largest single ticket entitlement listed for the person
c. Seven
Therefore, as I am still outside my 60 day resort window, with two 5 day tickets, I can make 7 days of FP selections for the three adults with two 5 day tickets. But once my window opens, I'll be able to make all 10 days, but only because I'm staying onsite.
He did say that some tickets have difficulty in the system, and don't result in these rules working correctly, and they need to manually fix it (specifically mentioned non-expiring tickets from pre-2007 - he did add the year might be off though, for this issue).
I didn't think of it while on the phone at the time, otherwise I would have asked specifically about party tickets. If you are staying offsite, and have a 7 day or more ticket, plus a party ticket, it seems you would be locked out of making FP for 8 days, assuming you wanted FP for 4-7 pm on the party day.
Lastly, he added that, just to give me peace of mind, while he can't imagine why I would have problems on my 60 day mark, he said that if I am locked out at 7 days for the salute tickets, I should make the last 3 days with the two 10 day tickets, and leave him a voice mail. He said he would then go in and manually copy those FP to the remainder of my party later that day.