I understand that AIV is just a guidance system. I really don't see much use for SRMs getting a guidance system, though, and I must note that SRMs are not supposed to have a shorter range than a Medium Laser (relative range brackets are identical in CBT). I'm not calling for a change to SSRM and SRM to match the 'relative' weapon ranges, just introducing some way for that to be possible through Artemis IV. It's not that SRMs are ineffective as current, they just don't feel to be quite becoming of the armaments that they are usually attached to. As it stands, only the smallest types of energy weapons have the range-bracket in which SRMs are used. I think it would add a lot to the game if we could sacrifice some Cbills and tons to increase the range of SRMs so they could hit at a longer range (not like it would be very likely for them to hit, though-which is what practically balances them).
Don't have much to say for logical tie-in, other than I imagine that improving the guidance system of a missile can increase its effective range.
For LRM? ... I imagine Artemis IV would just cause the missiles to go to the exact object that the user had their cursor/cross-hairs over when they fired the missiles. It would make for potentially instant lock-times provided the user was a "good shot". Plus if the target moved away from the crosshair while launching the missiles, only the 5-packs that were launched when the target was lit up would follow it.