Trickle chargers may or may not charge your NiMH fully.
NiMH manufacturers do recommend trickle, but only for keeping an unused cell at full charge at very low current (such as C/300, which means nominal charge transferred in 300 hours).
I don't know if they recommend it, but this is basically true. However I wouldn't bother without an expensive charger. As you mentioned full charge is usually detected by monitoring delta-V. Trying to detect a several mV change over a several hours time period with a wall charger having cruddy line filtering is very difficult. It just doesn't seem worth it when fast charging works so well.
NiMH batteries do not have a memory like NiCad batteries.; you can deep cycle them and probably trickle charger them to prevent them going flat. I don't bother. If the batteries are 50% or less, I stick them in the fast charger. So far no problems.
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