Problem with the OPs request is that it has 2 problems:
1)SSRMs, SRMs & MRMs can already be used to pick components off easily (you lead the missiles into the component); sure not 100% of the missiles will hit the component you are aiming for, but you'll get a good 30-80% hitting that component depending on circumstances. So this thread seems to be just about ATMs and LRMs and not a global missile tracking issue/suggestion.
2) ATMs and LRMs in CBT when they hit at all then use a scatter damage chart (spread of damage from these weapons is a fundamental behaviour of that weapon)...ERGO MW4s LRMs were designed on crack and should NOT be copied by MWLL in any way (we already have the MW4 style piss-stream salvo versus the canonical MW3 style swarm-cloud launch..and that's enough MW4 in MWLL for me!).
Personally I think we need a revamp of and ECM/LRM behaviour and things will be fine, I'd like to see:
A) Make Lock-on time a constant (say 3 seconds), a salvo launched before full lock will have it's Base spread increased proportionally (thus more misses).
B) Active/Passive Sensors & GECM do NOT effect lock-on time, instead they effect the base accuracy of the LRMs, therefore if you are active and without GECM then most of the salvo will hit (a similar spread to what we have now), with GECM running active many missiles will miss as their spread is increased, or they fail to track on launch (some from the salvo spinning away unlocked and simulating the GECMs interference effect).
C) AECM acts like active GECM for everyone within the Bubble, except the AECM user who has no anti-LRM benefit.
D) GECMs sensor reduction effect is toned down or removed completely (GECM is just too damn useful to be good for gameplay as is, we have Passive and BHP/BAP for ninja-playstlye, GECM would be on every 'mech I built it's such a massive benefit for low tonnage cost, BHP/BAP I would use situationally, but GECM as currently implimented I would use always....so it's certainly needs some work!).
TBH though, I'm pretty sure that this sort of thing is on the Dev-Radar, and personally I think we could use a Heat system/Coolant revamp/update before anything else (sick of arseholes cheesing it in NovaCats/Mad Bs spamming coolant....it's as boring and joyless as the new 1200m Clan Uber-ArrowIV Cheese aka: "Pointless random buff ruins gameplay...more at 11!")

).
This close to an update we are just better wainting and seeing what Soon
tm brings.