MegaTinyCore support help in Platformio

I was playing with megaTinyCore and it works well with Arduino IDE.
I was also looking into the guide they have for PlatformIO.
Note: megaTinyCore is not published in platformio’s platforms by the core developer (He’s is super busy with many things. So don’t to bug him).

Human.readable fuse settings in Arduino IDE setup:
So let’s say I have a target ATTINY-1607
In Arduino IDE, I can customise these attributes (which translate into then necessary fuse settings):

clock = 5internal
bodvoltage = 1v8 # BOD voltage level
bodmode = disabled
eesave = enable # Enable saving in EEPROM
resetpin = UPDI
millis=enabled
startuptime=0 
wiremode=mors
printf=minimal
attach=allenabled

I found (MAy. be I do not have all the information) I can only customise these few of these settings and they are as marked in [x] below and these would be:

[env:set_fuses]
; Fuse setting
; [x] clock=5internal
; [x] bodvoltage=1v8 ; no need as bodmode is disabled?
; [x] bodmode=disabled 
; [x] eesave=enable
; [x] resetpin=UPDI
; millis=enabled
; startuptime=0
; wiremode=mors
; printf=minimal
; attach=allenabled

board_hardware.oscillator = internal ; Oscillator type (internal or external)
board_build.f_cpu = 5000000L ; 5 MHz internal
board_hardware.bod = disabled ; 1.8V, 2.6V, 4.8V, disabled
board_hardware.eesave = yes
board_hardware.rstpin = updi

Note: I guess the printf is set in the platformio.ini in build flags as: build_flags = -lprintf_flt

The question, is now, how can we set the other params missing? Or do we have to manually adjust the fuses?

Some of the fuse settings I can see, when I see the Arduino IDE verbose, which uses the command:

/Users/<USER>/Library/Arduino15/packages/megaTinyCore/tools/python3/3.7.2-post1/python3 -u /Users/<USER>/Library/Arduino15/packages/megaTinyCore/hardware/megaavr/2.5.11/tools/prog.py -t uart -u /dev/tty.usbserial-14220 -b 921600 -d attiny1607 --fuses 2:0x02 6:0x00 8:0x00 -f $SOURCE -a write

So

Here’s my ini file (and the questions and dilemmas are in there in the comments):

[env:ATtiny1607]
platform = atmelmegaavr
framework = arduino
board = ATtiny1607 ; chip is ATTINY-1607 

; monitor_speed = 115200
; monitor_port = ""

; ---------- BUILD PARAMS ---------- ; 
; Fuse setting:
board_hardware.oscillator = internal ; Oscillator type (internal or external)
board_build.f_cpu = 5000000L ; 5 MHz internal
board_hardware.bod = disabled ; 1.8v, 2.6v (default), 4.8v, disabled.
; In the above step, guessing if it is disabled, we do not need to mention the bod voltage level?
board_hardware.eesave = yes
board_hardware.rstpin = updi

; The question is now, how can we set the other params missing? 
; Do we have to manually adjust the fuses responsible for the other parameters?
; What are the fuses for these or how can they be setup? (I was looking in boards.txt for the megaTinyCore used in Arduino IDE)

; millis=enabled
; startuptime=0
; wiremode=mors ;i2c related
; printf=minimal
; attach=allenabled

; [fuse2 / OSCCFG  = 0x02] (specifying 5MHz internal oscillator, but I guess we don't need to write this manually as we have already specified it) 
; For [fuse6 / SYSCFG1 = 0x00], guessing ti stands for "startup time" and if I wanted a 0 ms, it would be:
; board_fuses.SYSCFG1 = 0x00  ; fuse:6  -> startup time, 0ms ?

; [fuse8 / BOOTEND = 0x00]

; The fuse settings (`--fuses 2:0x02 6:0x00 8:0x00`) in the `upload_comamnd` were derived here after I looked into the Arduino IDE verbose output. 

; To enable interrupts on all pins: 
; board_fuses.attachmode=-DCORE_ATTACH_ALL ? 

; I saw in HELP, e.g of how to write: to write fuse byte 1 to 0xE0 on a kit, the. command would be: pymcuprog write -m fuses -o 1 -l 0xE0


; ---------- UPLOAD PARAMS ---------- ;
; Serial UPDI based programming setup
upload_protocol = custom ; to use serialUPDI
upload_speed = 115200 ; less aggressive baud than 921600
upload_port = "/dev/tty.usbserial-14220"
upload_flags = 
  -t 
  uart
  -u
  $UPLOAD_PORT
  -c
  $UPLOAD_SPEED
  -d
  attiny1607
   -v
  info

; ---- INSTALL GOOD PYMCUPROG for pio bfeore proceeding ----- ;
; execute: 'pio system info'
; get python path from 'Python Executable'
; install pymcuprog by: <python executable> -m pip install -i https://test.pypi.org/simple/ pymcuprog==3.10.4.136
upload_command = pymcuprog write $UPLOAD_FLAGS -f $SOURCE