Hi Wakko

I have tested your problem and indeed you are right.

I think that Yamaha intentionaly take off some features
of the 740 in order to make the difference to the top level
keyboards like 8000 and 9000. But doing this, I agree that
it is very stupid from Yamaha taking off some elementary
and essential features.

But, may be these tricks can help to solve some of your problems:
1 – Change the Fingered mode to Finger 1.
So, if you play 3 close keys (e.g. F, F#, G), only rhythms tracks
9 and 10 will continue playing. The others will stop until you
play a new correct chord. This is to make one type of break.
2 – We can prepare the style you choose for your song
recording, in order to make what you intend:
- Using the style recording feature, you can clear some tracks at
Main A, clear others at Main B or C or D, Fill’s,
Intros and Endings, as you like. In same cases you would
like the record same additional tracks to a style part to better
match your song. Also you can clear all tracks in a part
(e. g. at Count Intro) to use on Auto accompaniment as a silent
break when recording.
After you will use this style (e. g. 161) on Auto accompaniment.
3 - Now, as you can use all the 12 parts including Intros or Endings
in the middle of the song during the recording, use the Style parts
buttons according the plan you have in mind to the song you are recording.
4 - During the record, only use the Registration memories to quickly change
voices, effects and other related parameters.

I hope this is of some help

Best Regards
Carlos Rodrigues