Any skill has to be good enough to at least make me consider it before I max usual combat and tech stuff. And the above are not. (Leadership in it's current form isn't either, it was worth investing a few points mid-early when it controlled logistics cap)
The exact numbers are up for debate and balancing purposes, but I'm not sure that counts as "Leadership is weak" so much as "Combat/Tech is too strong".
Strategic stat boost weapons are a bad idea imho - they will be no-brainer on non-combat ships, which you never actually deploy.
Until you fight one too many battles, are forced to fight a retreating action, and then are forced to deploy all those "non-combat" ships which now have a hole in their already-minimalist defensive weaponry.
As I specified them, adding a Multiband Optics to a stock Buffalo would change its sensor strength from +1 to +1.5. This would, in turn, increase your fleet's sensor radius by about 20 units, say about 4% depending on composition. While it is a boost, I don't think it's an overpowering one.