I it possible to include more in the appimage to make it less system dependent?
Yes :
qelectrotech/usr/plugins$ tree
.
|-- bearer
| |-- libqconnmanbearer.so
| |-- libqgenericbearer.so
| `-- libqnmbearer.so
|-- iconengines
| `-- libqsvgicon.so
|-- imageformats
| |-- kimg_eps.so
| |-- kimg_exr.so
| |-- kimg_kra.so
| |-- kimg_ora.so
| |-- kimg_pcx.so
| |-- kimg_pic.so
| |-- kimg_psd.so
| |-- kimg_ras.so
| |-- kimg_rgb.so
| |-- kimg_tga.so
| |-- kimg_xcf.so
| |-- libqgif.so
| |-- libqicns.so
| |-- libqico.so
| |-- libqjpeg.so
| |-- libqmng.so
| |-- libqsvg.so
| |-- libqtga.so
| |-- libqtiff.so
| |-- libqwbmp.so
| `-- libqwebp.so
|-- platforminputcontexts
| |-- libcomposeplatforminputcontextplugin.so
| |-- libibusplatforminputcontextplugin.so
| `-- libqtvirtualkeyboardplugin.so
|-- platforms
| `-- libqxcb.so
|-- printsupport
| `-- libcupsprintersupport.so
|-- sqldrivers
| |-- libqsqlite.so
| |-- libqsqlmysql.so
| `-- libqsqlpsql.so
`-- xcbglintegrations
|-- libqxcb-egl-integration.so
`-- libqxcb-glx-integration.so
8 directories, 35 files