So I wouldn't buy. I like the TH series as being similar featured as an HK USP controlled gun. That's about it though.
The TH series has a false reset. If you google it video it, you'll see it. I hate that. But I also have grown to absolutely hate taurus with MANY guns bought from them since my first Millennium that started the G series today. (24/7, Mill, Mill Pro (9 and 40), TCP, 709, 92, GX4, and many of their revolvers. Not one has stuck around for me. I want them to, but they just don't.
The OP is concerned about that it's a two stage safety. One click down, decock, further pull on the same lever and it's safety on.
I for one like my SA/DA decocker only. So I get it. But no, I don't think there was a "fix" on the Taurus 24/7 that I had that was safety/decocker combo, so I wouldn't imagine there is a "fix" to make it decock only on the TH series.