It happens that I get so frustrated at the lack of a feature in JOSM that I actually go and implement it. The last time that happened I added regex search support. Now I've added plugin search support:

Now when I want to install some plugin it won't take me a minute just to find it.

Usually there are easier ways to implement features in JOSM. You just whine (kindly and specifically) on their bugtracker and the code fairies will take care of it.