In reply to Kemics:
The key to all training is progression and that implies measurement. You need to measure whether or not you are progressing in your climbing/training.
If you're not progressing then introducing a new exercise like finger rolls might be a one way to break through the plateau. Some of the first gains you make with any new exercise will be learning the movement and thus very specific to the exercise and not specific to climbing. However after a certain amount of time all the gains will be in terms of strength since there's only so much learning you can benefit from. After getting stronger at the exercise you might then need a period to teach your now stronger muscles in an isometric (or static) position, the way they're used in climbing.
Whether its a complete work out or not is really down to how much you do and at what intensity.
In strength training its generally best to do the minimum amount of work necessary to promote strength gains. That way you recover faster and more fully for your next work out: that is you start stronger. It also means when you plateau again you have something in reserve: you can ramp up the workload a bit more to break the plateau.
I think it's better to make slow but steady and continuous gains over a long period of time (say a year) rather than quick gains for a month or so followed by a long plateau or worse burn out or get injured. Not only will the gains be greater you should stay more motivated seeing yourself improve continuously too.