as for giving auto access to homelands when you join the alliance, i'll say no, because then you'll get loads of players joining an alliance purely to look around Golemus or Necrovion, and then quit the alliance again, which annoys (well it does me anyway)
as for giving key access, there's are keys around you're right, but again you'll get the same problem, join alliance, get the key access, leave the alliance, and the access is forgotton to be taken away from the player giving them auto access whilst not being in the alliance
the places are *meant* to be hard to gain access to