This problem occurs due to the way the dll gets vehicle information. Due to the way the vcmp rcon protocol is, no information about vehicles gets sent until somebody enters a vehicle.
A way around this is to use the same method as the WSV, which reads a copy of the config.ini, parses it and aadds the information into the internal pools.
This should fix the problems with vehicle IDs. since doing //echo -a $vcmp.vehiclenamemodel( 190 ) returns skimmer.