[Android Q&A, Help & Troubleshooting] michelsberg:
This is a very pleasant surprise. Thank you both, osm0sis and TKruzze!

If anyone is interested, this is my verbosely commented gapps-config.txt for a pico install with Google Calendar Sync and a few CM apps removed:

# How-to
# ======
#
# Configuration is read line-by-line and everything after
# the character "#" is ignored, i.e. a comment.
# The tk_gapps installer searches for pre-defined keywords, for example
# "debug"/"nodebug" to toggle detailed debug logs on/off.
#
# Keywords:
#
# Debug # produce a detailed debugging log file (default)
# Nodebug # don't do the above
# Exclude # Exclude all the mentioned packages in the installation (default)
# Include # Include ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
# PackageName # Exclude/Include a certain app or framework from/in installation
# (AnyApp) # To remove any (non-Google) app from the /system partition
#
# Official description is here:
# http://xdaforums.com/showpost.php?p=60944096&postcount=4
# If the official description differs from this one, the official one
# is correct.
#
# This is my (michelsberg) gapps-config.txt for a really-minimal
# gapps installation and with removal of some CM system apps.

# Produce detailed logs
Debug

# base package to install, even if a larger zip is flashed
PicoGApps

# Include or Exclude the listed apps?
Exclude

# gapps to ignore/remove
# ======================
#
# Only one of them is in pico anyway, but just be a bit paranoid...
#
Books # [Stock/Full] Google Play Books
CalendarGoogle # [Stock/Full/Mini/Micro] Google Calendar
CalSync # [Stock/Full/Mini/Micro/Nano/Pico] Google Calendar Sync (installed by default when Google Calendar is NOT being installed)
CameraGoogle # [Stock] Google Camera
Chrome # [Stock/Full] Chrome Browser
CloudPrint # [Stock/Full] Cloud Print
Docs # [Stock/Full] Google Docs
Drive # [Stock/Full] Google Drive
Ears # [Stock/Full] Sound Search for Google Play
Earth # [Stock/Full] Google Earth
ExchangeGoogle # [Stock/Full/Mini/Micro] Google Exchange Services
FaceUnlock # [Stock/Full/Mini/Micro] FaceUnlock
Gmail # [Stock/Full/Mini/Micro] Gmail
GoogleNow # [Stock/Full/Mini/Micro] Google Now Launcher
GooglePlus # [Stock/Full/Mini] Google+
GoogleTTS # [Stock/Full/Mini/Micro] Google Text-to-Speech
Hangouts # [Stock/Full/Mini] Hangouts
Keep # [Stock/Full] Google Keep
KeyboardGoogle # [Stock] Google Keyboard
Maps # [Stock/Full/Mini] Maps
Messenger # [Stock/Full] Messenger (not installed on tablet devices)
Movies # [Stock/Full] Google Play Movies & TV
Music # [Stock/Full] Google Play Music
NewsStand # [Stock/Full] Google Play Newsstand
NewsWidget # [Stock/Full] Google News & Weather
Photos # [Stock/Full/Mini] Google Photos
PlayGames # [Stock/Full] Google Play Games
Sheets # [Stock] Google Sheets
Slides # [Stock] Google Slides
Search # [Stock/Full/Mini/Micro/Nano] To Exclude BOTH Google Search AND Google Now Launcher
Speech # [Stock/Full/Mini/Micro/Nano] off-line Speech files (Required for off-line "Okay Google" support)
Street # [Stock/Full/Mini] Street View on Google Maps
Sunbeam # [Stock/Full] Sun Beam Live Wallpaper
Talkback # [Stock/Full] TalkBack
Wallet # [Stock/Full] Google Wallet
YouTube # [Stock/Full/Mini] YouTube

# stock packages to ignore/remove
# ===============================

Browser # Stock/AOSP Browser
CalendarStock # Stock/AOSP Calendar Application (automatically removed when Google Calendar is installed)
# CameraStock # Stock/AOSP Camera Application (automatically removed when Google Camera is installed)
# CMAudioFX # Stock CM AudioFX Application
# CMEleven # Stock CM Music Application
# CMFileManager # Stock CM File Manager
# CMWallpapers # Stock CM Wallpapers
# DashClock # Stock DashClock Application (found in certain ROM's)
Email # Stock/AOSP Email Application
ExchangeStock # Stock/AOSP Exchange Services (automatically removed when Google Exchange Services is installed)
# FMRadio # Stock FM Radio Application (not found on all devices or ROM's)
Gallery # Stock/AOSP Gallery
# KeyboardStock # Stock/AOSP Keyboard (automatically removed when Google Keyboard is installed)
# Launcher # Stock/AOSP Launcher(s)
# MMS # Stock/AOSP SMS Application
PicoTTS # Stock/AOSP PicoTTS
SimToolKit # Stock/AOSP SimToolKit Application
# Studio # Stock/AOSP Movie Studio Application
SykoPath # To remove SykoPath OverlayManager (found in certain ROM's)

# custom/universal application removals
# (cannot be used to remove more Google apps)
# ===========================================

(BasicDreams)
(Calculator)
(CMAccount)
(DocumentsUI)
(Galaxy4)
(HoloSpiralWallpaper)
(HTMLViewer)
(LiveWallpapers)
(LiveWallpapersPicker)
(NoiseField)
(PhaseBeam)
(PhotoTable)
(PhotoPhase)

edit 2015-06-07: updated gapps-config.txt according to current tk-gapps installer.