Well I am not sure what the problem is. However as I said...
If you will use the gamesbd as an info source (i.e. info_source thegamesdb.net not info_source listxml) when you build the list the list should contain long names even if you use mame roms for coleco vision on mame.
But that does not explain why you attract mode config is not working...
Could you post your mame.ini file please? specifically just these parts so that i can see your path setup please
# CORE SEARCH PATH OPTIONS
#
homepath .
rompath M:\Emulators\mameplus\ <-make sure you have this
hashpath
samplepath
artpath
ctrlrpath
inipath
fontpath
I tired with my mame after changing my rom path and AM will not work... Put the right path in in the correct place and it works fine
if you need to make an ini file go to your mame directory and type
mame -cc