In Napoleon, we also use 'Tab' as the context-sensitive help key. 'Backspace' along with the number keys '1' through '6' provide various status reports, or allow you to access static help/info screens. (As you noted in regards to 'y', though, number keys have other effects in cheat mode.) In the current major project that I'm working on, and hope to release shortly, I chose to use 'Backspace' as the context-sensitive help key, displaying info about the active unit and/or tile. 'Tab' is a "menu" key that brings up a dialog box allowing you to pick from a list of options which are not tied to the active unit. Most of these are status reports of one type or another, but a few allow you to initiate in-game actions that are not unit-specific. I guess I took this approach because I'm familiar with several other apps where 'Tab' is used to access an auxiliary menu, and that seemed the most natural or instinctive choice. So overall, I'd say I like having both 'Tab' and 'Backspace' be available for help and supplemental functionality, and I'd be in favor of your proposal of using 'k' and 'u' as munitions keys -- which, if they're providing related functionality, have the added advantage of being close together on the keyboard.