It's similar to the AU KDDI Keitai bots; they had a "Bluetooth phone notification light" that flashed when connected to your phone (which already flashed an LED if we got a notification).
Apart from the PC peripheral parts, the only "recent" TFs that functioned the same as their alt modes were the music label Soundwave, Rumble and Frenzy, which turned into an MP3 player and headphones respectively. I loaded sound/voice samples of G1 Soundwave onto mine and popped a cheap and small(ish) unpowered external speaker into the headphone jack on his shoulder (Which could be bought from a ¥100 shop). I'm surprised that MP Soundwave didn't have such a feature built into him.
Anyway, from what my Japanese friends have said, none of the camera bots work as cameras. The robot parts in the lense would interfere for a start:
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https://youtu.be/8WZeAwAvuCY