Starmaps I would love to have 3D starmaps, but practically, and very reluctantly, I have to agree they are too hard to do at present for a table top pen & paper game. Someday when my cell phone can project an image on the table (no need for a holo), it will truly be something I can bring to the table. (that's probably only 5-10 years off
)
Computers Never had much problems with the size, certainly might lower it for civilian applications and small craft. I've always imagined that the computational power to adjust the drives, maintian the powerplant containment field and calculate jump coordinates is enormous, yes computers are a factor of 1 million more powerful but the tasjs the are asked to do are even more powerful/difficult.
Aliens One of the saddest parts of Traveller for me, only Star Trek and Star Wars suffer more from the man in a rubber suit complex. Traveller says it is a matter of being playable, the TV and movies a matter of budget. The ideas are still too simplistic for my sci-fi taste. Certainly make near humano-form aliens for playability but do they need to be based on cats and dogs, with our preconceived view of their psycology as well? Hivers rock (and no they are not the Jockta in disguise, the Jockta stood upright
). Broader sci-fi is full of more braodly imagined alien aliens. James White, Silverberg, Niven (even with the Kzin), David Brin, etc. all bring good ideas IMO. Maybe pick up "Barlowe's Guide to Extraterrestrials" and start from there.