I can not "catch" the work of new combinations.

Moreover, they can work quite well, but the speed / quality of the plugin is poor. By pressing other combinations about 8-10 times, the combination works for me a maximum of a couple of times. In this situation, by pressing J+SN, I caught J+S a couple of times and that's it.

Given this, I would prefer to use a combination of 2 buttons at most.

Just thoughts. Given the prospect of expanding combinations for the plugin in the future + simplifying so that any combination consists of simple 2 buttons, we could divide them into groups.

For example, group J (base):

J + S Search,
J + O Options,
J + H Help,
J + M Toggle Menu,
J + Х Overview,
J + D Home Dashboard,

Group H (conditionally ... The letter A from the word actions will be too close to labels.):

H + S Save,
H + C Save & Close,
H + N Save & New,
H + D Save & Copy,
H + Q Cancel/Close

This will make it easier to select a paired letter (label).

Again, all of this only makes sense if the plugin is going to be extended in the core.

can't say i am a fan. much better to just have one key act as the trigger. Also I cant replicate your issue with activating the shortcuts

Moreover, they can work quite well, but the speed / quality of the plugin is poor. By pressing other combinations about 8-10 times, the combination works for me a maximum of a couple of times.

Probably you pressed the keys too fast? There must be a small time between. You can manipulate the time in the plugin.

About grouping the keys: For normal users the grouping is not obvious (remember: don't make me think).
My opinion is, that users have a kind of reflex in pressing shortcut keys ... always first J ..and should not think about which one could be the first key.

This pull request has been automatically rebased to 5.0-dev.