12bit capture

Hi, I´ve been trying this software for capturing VHS footage on my BlackMagic Intensity Shuttle. I've compared the resulting file specs from MediaExpress and vrecord. Using MediaExpress with Apple Prores 4444 I get a 12 bit file (yuv422p12le) but you software only seems to allow 10 bits (yuv422p10le). As your software has more advanced and archiving features I don't understand why It only offers 10 and 8 bit captures. Is 10bit suitable for archiving? Are Apple Prores "12 bits" real? Thanks in advance.