Hi anthonysavatar!
Yeah I've answered these questions many times, although not necessarily on the forums
(the community is split up all over the place...)
2x2 Tiles
Would having a double character/tile size for the map be a viable option? I can read the UI text alright but the map not being zoom-able is a challenge. For now I'm just using the windows magnifier at 2x which illustrates what I'm thinking (screenshot attached).
You wouldn't be able to see as far with this feature but the map is scrollable so it's not really a loss. I'm not suggesting you create a totally new tileset, just allow for drawing the map cells at twice their normal size. If your implementation uses something like libtcod I can see how that might be a difficult feature to add without making new artwork or custom characters.
Nope, not possible, as an emulated terminal the engine isn't capable of that. And 14" is quite small! Asset wise
as you can see there are plenty of larger hand-scaled tiles for huge sizes, but they aren't used unless at a higher resolution. But that doesn't really matter, because all you really need is a physically larger screen to have everything show larger. Emulated terminals divide the screen into X rows and Y columns, creating a grid which can't be distorted like you're thinking (gameplay and UI issues aside!), but the set number of rows means that regardless of your screen size there will always be 60, so big screen = tall 60 rows, small screen= short 60 rows...
UI Coloring
Is there a way to set your preferred UI color? I'm hoping for amber or white text for the UI. This would help a lot with accessibility.
There are a lot of customization options for visual accessibility depending on what you need. There's a colorblind option, and also lots of filters for tweaking colors, brightness, contrast, etc. These are described in the manual under the Color Customization section.
Keybinds
Is setting custom keybinds possible? I'm not seeing an option anywhere.
This is in the manual, too. You can search for keybind. It's not a really great system, however--what are you looking to do with it?