By purchasing a key from Uniden and entering to the radio with updated firmware you can do yourself to the 536 and 436.
No idea what you are describing re: DSD+, which is a software program used in a computer, and not a scanner, but you can do that yourself too, just not in a scanner.
Mark
WS1095/536/436/996P2/HP1e/HP2e/996XT/325P2/396XT/PRO668/PSR800/PRO652