Enhancing CATS - Record Working Time

Hello I need to enhance the record working time applications. I have 2 specific requirements.

1. I need to introduce a new column in the ALV to record time. The new column needs to display the task description. I tried to do this via configuration in SPRO however the field just doesn't show up. Field I am trying to add is CATSDB-LTXA1 in the data entry section of record working time.
2. I also need to change the search help for AUFNR. Currently its displaying the SAP standard search help. I need to change this to a freely programmable search help - how would I go about doing this?

Thanks,

Dan