Tab jumps to the next block in a training session. The same tab that you use as Alt-Tab to toggle between eg. Netflix and Virtual - and sometimes, Virtual seems to forget that there is Alt pressed. That leads to an incomplete training session, and sometimes you see that after the ride (because it becomes "magically" shorter than planned).
Please switch to another key, or make it a config option (different key, switch off, whatever).

On my Mac OS Sequoia 15.2, the keyboard stroke to increase the virtual gear '+' key doesn't work on Number keypad or regular keypad.
Need to use the '=' equal sign. I do notice the '=' sign is the same key as the '+' key but without hitting shift.
Is this functioning correctly?

From use and like to use the keyboard shortcut to adjust the virtual gear during training.

I think the + - buttons are inconveniently located for use.
Please consider adding "arrow up" and "arrow down" or "arrow left" and "arrow right"buttons for gear adjustment.

The group arrow buttons are in a more accessible location for frequent adjustments during training.

Many laptops don’t have page up/page down, and thus can’t adjust interval intensity without clicking on the screen!

Finally, I decided to use a multi-key programmable keyboard, which is widely available in many online markets. The keyboard can be attached to the handlebars using any preferred method, and depending on your preferences and budget, you can choose from 2- or multi-button keyboards, ones with knobs or joysticks, as well as wired or wireless options.

I want to add:
I use the mouse while training on TPV. It works fine for me but I do need to use a stand in front of my training bike.
I understand not everyone would like to use a stand, so I see two solutions:
1. create a handlebar controller for TPV with freely customizable buttons
2. create a key mapper as suggested here that work with as many devices as possible. I tried a bluetooth remote witha a third party key mapper but the response time was very slow.