Why not have both?
Mechanical Keyboards
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I'm currently on a TLK, and mostly because I want to learn to stop moving my hands away from the home row. It's not even only about arrows, but also home/end page up/down etc. and combinations with them which I use a lot and it just get slow and weird since I have to reposition my hands every time... mine is currently quite limited in what I can program it to do unfortunately.
Sorry, forgot to respond, I use fn+arrows for home/end/pgup/dn. This is why I got a pcb that was capable of accommodating the arrow cluster (dz60, bt60v2. I use a lot of combos with shift and ctrl as well to select/mark stuff and jump back and forth, so barring getting used to hjkl, I found this more comfortable.
I haven't made a keyboard in awhile but anything that supports QMK (or whatever is new and shiny today) should be able to support this.
QMK and the like are custom firmware so you can pretty much code up whatever feature you need.
If you are looking for a pre-built, I know my Tofu65 supports QMK from https://kbdfans.com/.
QMK is written in C but they do have a no code tool I used for my Tofu65: https://config.qmk.fm/#/.
If the tool doesn't cover your use case and you are able to do a little C, these sections are good starting points for layers (what you call modes) and cursor keys.
QMK looks good, also because I'm familiar with C. I'll probably go with a prebuild to start out since I'm mainly interested in customizing the setup for now, thanks!
Any keyboard that supports qmk should work for this. You can enable mousekeys and there are also functions to toggle layers
very nice pointer, have you flashed this on any keyboard?