explanation: now i play a campaign, where upgrading a unit on a friendly sh is possible. afaik, this can be done only at hq. when the player has lots of similar units, it's harder t find which one can be upgraded. so i suggest to add either the <n> for hq view, or the left and rights arrows for moving to the previous/next unit:

alternate solution: a new hotkey for normal map view upgrading the selected unit (if possible), e.g. <ctrl>+<u>. however, cycling the units in hq view still can be useful (e.g. for manual refit/os in a no-auto-refit campaign)