the current LCL's TDBLookUpComboBox does not have KeyValue property. This is very unfortunate and I think very badly needed. I am considering taking the time to implement it myself, but before I would like to know if there are any (open source) third party components which have a more advanced DBLookUpComboBox
Another deficiency is no way to limit to the lookup items. A user can fill the text box with useless characters that don't specify any record of the listsource.