It's actually not the laptop issue that's holding me back, as the arrow keys aren't used for movement but for scrolling the screen around anyway. You can currently use the numpad, or the WASD keys for movement.
Part of the initial impetus is just tradition. Caverns of Xaskazien 1 had only 4 way movement, and 2 began as a simple graphical update to 1.
Part of it was that I read in some article somewhere about roguelikes (or maybe it was discussed on Roguelike Radio?) that newer players tend to find 4 way movement easier to understand and start out with.
Part of it is that I don't want players or monsters moving through impossible diagonal spaces between two walls. You can do that in a lot of games (like Angband), and it'll be confusing for some folks that you can't move from one empty square to another if walls are in a certain configuration. I know a lot of people find Brogue frustrating for that simple reason (you can't cut corners if there's a single wall horizontally or vertically adjacent). I wouldn't be quite that restrictive, but some people just won't grasp it.
Part of it is, honestly, just the coding of it again. It wouldn't take much - probably just an afternoon - but recoding those wall restrictions (monsters used to be able to move diagonally, so the old code might still be in there, just remmed out), and recoding the autowalk, since you can click any square to pathfind your way there will take some effort.
All that said, I do play a lot of Angband variants and such for my ROGUELove youtube channel, and even I find myself instinctively trying to move in 8 directions now, so it's on the eventual to-do list. Given my injuries, I can only use a computer a few hours a day anymore, so I have to prioritize. I've just started work on a huge new perk system, and that's going to take a long while, but perhaps after that I'll find the afternoon to do so.
At the end of the day, this isn't my career - I'm an actor, not a coder. It's something I work on because I enjoy the evolution of the game, and I like playing the game, since it's made to my exact specifications. If others can enjoy the game too, that's cool.
Krice, lemme know if you do try the game and your thoughts at that time. I know I'll get to Kaduria and Teemu eventually for the channel, if they're downloadable somewhere.