Consider adding session script wrapper, not moving a binary there. Anyway a binary is named startlxqt now. And if you do not want to provide a starting script (what looks better for me), just install a symlink, i.e. code will look like

```
	dodir "/etc/X11/Sessions"
	dosym "/usr/bin/startlxqt" "/etc/X11/Sessions/lxqt"
```