No issues, go ahead.
My wife knows my AP password so when I die and I know I will one day, she can access my account and fly using my points, for herself, family or friends. I will be dead thus not able to use them. I can't will them, gifting is expensive and booking for others I can't as I will again still be dead.
I have booked trips for others with my priority award and have booked for others as regular. On my AP account, I have my wife and son on there so it's easy to book for them. When booking for friends I just add them and I have never had an issue, while alive. When I am dead, I really can't say for sure right now.
I should mention when my son was a minor I controlled his AP account and booked a couple of trips for me. I figure I paid for his flights, he owed me! No issues at all