Yes .... in the default v4 theme rtconfig we find this in the set.trans section
set trans.size.minmax [500 40 2048 200]
So it SHOULD work with tcp/mcp/env as well
Note the brackets for the numbers.
Note the fullstops, not underscores, between the words
note the "set" at the start
WT imperial does NOT have any of these this for his
mcp_min_height 850
The mystery deepens
.