Lafiel
Right now only the nuke has a wide enough splash radius for it to even matter, but even if more explosive weapons were added (inluding the ones that you or someone else will add to some mod), I don't really see a problem with the game punishing players for using them recklessly and rewarding those that use control groups and hold fire.
Of course having the function there so AI ships won't use such weapons stupidly makes sense to me and should probably be added, I just don't think any of the weapons currently in vanilla should have a minimum range. Even firing a nuke point blank should be an option.
And for modded weapons, you would know better than I do, but couldn't you just have a projectile replace itself if you wanted it to be "armed" a second or so after being fired? Make it spawn another projectile with same location and velocity as a death effect.