Yeah, I think you should be able to use numeric in trim mode.
The other one is not a bug and just a question of taste. Should be left like this in my opinion.
i remember before 2.10 and the ability to move start and end point with q links, a friend showing me how to edit it with numeric value so i guess it is a bug but i hardly use it so i don t know.
for poly/mono i guess a user choice setting should be remembered in memory coz we don t all have the same work method.