Analog for RDMA_DEFAULT_MAX_RECV_WQE is I_MPI_DAPL_RECV_QUEUE_SIZE
( from version 4.0) and I_MPI_RDMA_RECV_QUEUE_SIZE ( for versions 3.x.x). Please pay attention that for RDMA mode DAPL recv operations are not used (by default) and this variable has no influence. Only setting I_MPI_DAPL_RECV_QUEUE_SIZE=0 you can save memory for each connection. But some old providers may fail with I_MPI_DAPL_RECV_QUEUE_SIZE=0.
Intel MPI Library has 2variables: I_MPI_DAPL_REQUEST_QUEUE_SIZE and I_MPI_DAPL_REQUEST_QUEUE_RESERVE. Their sum is MVAPICH2's RDMA_DEFAULT_MAX_SEND_WQE. I_MPI_DAPL_REQUEST_QUEUE_RESERVE is usually quite small.
DAPL UD is connectioless transport and there are no exact analogs. DAPL UD is more like SRQ.