Looks like COMMAND is the only access.
What I did find:
0 "none"
1 Schematic Curve
2 Schematic Connector
4 Duct Curve
8 Duct Connector
16 Pipe curve
32 Pipe Connector
64 Electrical Curve
128 Electrical Connector
256 Wireway Curve
512 Wireway Connector
TIP:You can also enter the following ABS snaps on the command line, which can be helpful if you miss a connector during object selection: SCON (Schematic Connector), DCON (Duct Connector), PCON (Pipe Connector), ECON (Electrical Connector), WCON (Wire Way Connector), SCUR (Schematic Curve), DCUR (Duct Curve), PCUR (Pipe Curve), ECUR (Electrical Curve), and WCUR (Wire Way Curve).