Make abilities only highlight units that can be affected.

Please can you make abilities that only affect certain types of units (such as minions or enemies) only highlight valid targets. One main problem I've had is using Mulch Shambler and not being able to select my shamblers in amongst a huge melee of reinforcements and demigods, I mean, I can't mulch any other unit type, why the hell should the game highlight other units then?! Now I understand that it may take skill to quickly target an enemy efficiently, and that this may be a factor in separating good from great players, but there are few (if any) abilities which are quite as important in emergencies as mulching and require a very specific (and small, sometimes short lasting) target.