System settings > Input Devices > Advanced > Position of Compose Key lists a number of options. However on a laptop where spare keys are limited most of them aren't really good. On the other hand my laptop has a few keys which aren't useful for anything (such as XF86Calculator and etc.) and I'd like to assign one of them to Compose. Is it possible to set those values in $HOME/.kde/share/config/kxkbrc manually and what should be the syntax there?

For example currently on my desktop system it has such setting (when it's set to Menu key):

Options=grp:rwin_toggle,compose:menu

So can I set it somehow to XF86Calculator?

You can use one of this options:

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grep 'compose:' /usr/share/X11/xkb/rules/base.lst

It may be possible to just map eg. the calculator to caps lock (or another of those keys) eg. via xmodmap or a custom xkb definition to "trick" the option. Never tried.

luebking wrote:You can use one of this options:

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grep 'compose:' /usr/share/X11/xkb/rules/base.lst

It may be possible to just map eg. the calculator to caps lock (or another of those keys) eg. via xmodmap or a custom xkb definition to "trick" the option. Never tried.

I see. Those same options are basically exposed from System Settings.

Good news: you can cheat it =)
run "xev -event keyboard", ensure the xev window is focused and press the calculator key.

There'll be a line like

state 0x10, keycode 148 (keysym 0x1008ff1d, XF86Calculator), same_screen YES,

now map the keycode ("148" in this case)

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xmodmap -e 'keycode 148 = Multi_key'

Thanks, I'll give it a try.