Ended up doing a character bingo instead of ship, but I'll answer here. :D

MogaMob
I think their dynamic is interesting, but I am not much of a multi-shipper & whatever breaks up RMR is not really my cup of tea.
I liked Mogami arc & Mob torture & in some scenarios I can like when it's sexual, but tbh what I like most is when it's over & the OTP Hurt/Comfort time starts lol.
So, MogaMob as a brief interlude to further ReiMob, yes, as an endgame ship (like with all other Mob & Reigen ships) no, regardless of if abusive or with actual feelings.
What I could find more interesting as going on for a longer while would be all three of them together. Mogami & Reigen seem a bit of an underexplored dynamic both in canon & fandom tbh.

ToiSho
Nope...
While sibling incest can be alright, parent/child incest squicks me quite hard... I often feel a little unwell seeing it tbh. (but I don't mind ppl shipping it of course, it's just really not for me)
If you put another generation in between it's ok again I guess kjfgksfh (looks @ Rick & Morty)