Auto-split feature has been refactored to create exact 0.1 THA UTXOs and leave change for an additional output. Previous strategy (to distribute change evenly across all splits) raised some controversies and therefore is abandoned as of this version.
Auto-merge feature has been added, for convenient merging of previous splits into more valuable UTXOs. These merged outputs then would be subject of splitting, yet under new strategy explained above.
For auto-merge to work user needs to add mergetoaddress=address to tha.conf or to fill the address in via tha-qt input dialog. Empty address disables automatic merging, as well as invalid or non-owned address.
Manual merging is also possible via mergetoaddress RPC command, check the help for more info.