qcomposeplatforminputcontext does not support returning multiple keysyms

Hi!
Sorry for my English.

Qt5's compose is defective by design. It returns only one symbol.

man 5 Compose says:
Each compose sequence specifies one or more events and a resulting input sequence, with an optional comment at the end of the line:
EVENT [EVENT...] : RESULT # COMMENT
The result specifies a string, keysym, or both, that the X client receives as input when the sequence of events is input:
"STRING" | keysym | "STRING" keysym

Many peoples use compose to shortcut text snippets, such as complex commands, parts of code, etc. For example there is part of my ~/.Xresources

<Multi_key> <z> <s> : "| sort | less"

<Multi_key> <z> <d> : "colordiff -aur %d/%f %D/%F | less"

<Multi_key> <z> <p> : "ps -H -eo user:24,pid,%cpu,cputime,rss,size,nice,stat,start_time,args | less"

<Multi_key> <z> <a> <c> <n> : "getfacl -E -R %s | sed 's|^\\([^#].\\+\\):SRC_NAME:\\(.\\+\\)$|&\\n\\1:DST_NAME:\\2|' | setfacl --restore=-"

But Qt5's compose returns only first symbol. Application based on Qt5 is no longer suitable for such use. Time spent grow dramatically.

Fix it please.