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In case there is any confusion, stretch tuning can go with equal or unequal temperaments. They don't mean the same thing.

The reason for equal temperament in keyboards is in order to divide up the twelve semitones in the octave equally so that no key sounds worse than another when you play a scale. In order to achieve that, thirds are all slightly sharp and fifths are all slightly flat. Other intervals are likewise all slightly off the mathematical ratios.

But we've all got used to that over centuries....

You are right, Bennevis, stretching and scale tuning (temperament) are independent pitch modifying patterns and should be freely and conveniently combinable which is not implemented yet in this manner with most of todays SW Pianos.

One could easily define a feature list what should be implemented with all of DPs as a minimal requirement (I could) , because these are very straightforward programming tasks. Marketing departments see temperament features often as one part of their playground area where they can let disable some of these features in software to provide cheaper instruments and to support prices of higher end ones. (While this practise is perhaps not a scandal, but the conscious customer should be at least aware of this.)

We had a previous topic where most of these questions were explored in detail:Temperament questions

One more remark here: the smaller your acoustic is the wider the applyied stretching is. (Mostly because due to the heavily copper-wired bass strings the image is more distant from the ideal sinus wave overtones series).

I found p. 80 in my Roland FP-4 manual with directions to reset my tuning back to the default setting of "equal" temperament.

Press Function Key then Piano key. There were 7 choices:
1. Equal
2. Just Major
3. Just Minor
4.Kimberger
5. MeanTone
6. Pythagorean
7. Werchmeister

It seems to make a difference, but I'll keep playing chords from my Grieg and Schumann pieces and listen for a few days.

Do you know which temperament your FP-4 was set to when you thought it sounded out of tune?
Some of the unequal temperaments are more 'extreme' than others, but if you play music predominantly in one key, you may well like the unequal temperament - thirds and fifths are much more 'in tune' and mellifluous-sounding - provided the temperament key (C is the default) is the same as that of the music.

Unless we play (or have heard a good musician play) a string instrument like the violin (where the pitch of notes can be infinitely varied), many of us have never heard what a third with a frequency ratio of 1:1.25 or a fifth with 1:1.5 sounds like.......it can sound odd, or olde worlde folksy .

Have a listen to these examples: http://youtu.be/VRlp-OH0OEA and see what you think.