Works with files or directories, with periods in any position within the file...

Works with files or directories, with periods in any position within the file or directory and with spaces in the filename.

softlink.desktop

 [Desktop Entry]
 Type=Service
 ServiceTypes=KonqPopupMenu/Plugin
-MimeType=all/allfiles
+MimeType=all/allfiles;inode/directory
 X-KDE-Priority=TopLevel
 Actions=softLink
 
 [Desktop Action softLink]
 Name= Soft link
 Icon=insert-link.png
-Exec=FA=`basename "%F"`;FE=${FA##*.};FN=${FA%.*};ln -sT "%F" "$FN"_lnk."$FE";
+Exec=FA=`basename %F`;if [[ $FA =~ .+\\..+ ]] ;then FE="_lnk."${FA##*.};FN=${FA%.*};elif [[ $FA =~ ^\\..+ ]];then FE="_lnk";FN=$FA;elif [[ ! $FA =~ \\. ]];then FE="_lnk";FN=$FA;fi;ln -sinT %F "$FN$FE";