Exactly! That annoys me so much, every time I go fishing in the park with my elder sim a few hours later he starts having low bladder I send him home but he walks so slow with the squat-walk that he pees himself half-way there. It happened twice already.
It really annoyed me because my sim lives in a two-story house with both bathrooms on the upper floor, she was out in the garden when I noticed how lowe her bladder need was. So I sent her upstairs, and she freaking wets herself like two steps away from the toilet. I face-palmed so hard I almost broke my nose. Seriously, a (to use an Australian term) pee-bolt animation needs to be added.