I normally find no fault with Andrew's contributions, but I would like to point out that propagating an altered copy of a quasi-standard device from a common library can cause problems if you ever share your schematic with others that don't have access to where you placed the altered copy. Fortunately, there is another solution which avoids this problem!
Here's the steps:
1. Create a small text file that contains the following lines.
defineLrgFreq quantity \Originally posted in cdnusers.org by SGG_RFIC
description="Frequency in Hz" \
2. Save the file with a name like "frequency_nature.scs" in a path that would be accessible to anyone that may end up using your schematic.
3. In ADE, do Setup->Simulation Files... Add the path of the file in Include Path and the name of the file in Defintion Files.
Now, just leave the freq_meter as is and referenced from the standard ahdlLib. Netlist and Run will produce a netlist that lets the freq_meter operate at a higher frequency! Then save a state so that others can recall it and get your modification included already.