*spiked chain : it is supposed to gain the off-hand and light blade properties via the spiked chain training multiclass feat, however it cannot select light blade enchants, and more importantly is not treated as being offhand for the purpose of being able to equip it in the off-hand if for example you have taken the eternal defender epic destiny which allows you to wield 2H weapons as 1H weapons, and SHOULD allow a normal sized spiked chain to be wielded in both main and off-hands WITHOUT either the ranger two-weapon fighting class feature or the same feature gained through the two-blade warrior multiclass feat.
*spiked gauntlet : it is supposed to occupy the hand item slot, it says so right in the item description, and it is well understood that you can wear this item AND have both hands holding either 2 weapons or a 2H weapon, yet in the character builder it can only be equipped to either the main or offhand weapon slot.
*shields : since you can only benefit from either a magic shield OR a magic item in the arms slot but not both, and by page 224 of the PHB you only benefit from the magic properties and powers of which ever item you equipped first if you are wearing both, there needs to be some way to nominate which one is in effect when both are worn.
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Additionally, I have noticed a few features which are conspicuous in their absence, which really need to be added to make the character builder more functional :
*there really needs to be a selectable feature to apply conditions such as bloodied, possessing temporary HPs, longtooth shifting in effect, selecting which genasi elemental manifestation is in effect, etc. since there are quite a few feats, class features and powers which do not show their bonuses by default. Particularly the genasi elemental manifestation, since one of them is always assumed to be 'on' by default.
*better coding is needed to express the relevant bonuses from secondary stats mentioned in many powers : where a power hit or effects text mentions that several stats are candidates to add their respective bonus to a power, only the last one mentioned is actually shown and calculated... all the respective bonuses should be shown, and there needs to be the ability for the user to choose which of the mentioned bonuses is actually to be used... a particularly glaring example is the pit fighter (fighter paragon path) 16th level feature 'dirty fighting' which mentions that the WIS bonus is to be added to all damage rolls, minimum of 1, and guess which stat is used in the automatic calculation? yep, the 1, not your actual WIS stat
*there needs to be an option to select a feat, class feature or power as being in effect for the purpose of calculating damage, even if they are normally situational or otherwise not 'on' by default : a good example of this is the bloodclaw or reckless weapon properties... it is very common for these to be taken for granted as being used for every attack... the same goes for power attack... it would be much more useful for players needing to keep track of all their possible +damage effects if these could be selected to be shown somehow.