For instance, if a user tries to write jalr x0 0(x1) the tooltip should also state that jalr has the format
jalr [rd] [rs] [imm].

Some RISC-V instructions perform writes to 2 destinations, either 2 register or register or program counter. In cases if the source of one sub-operation matches a destination of another one, the order of result output is important. The examples are jalr and instruction operating with CSRs:

riscv/riscv-tests#258
riscv/riscv-tests#263

Your obj

The link on the project front page to the wiki ( https://wiki.umd.edu/DRAMSim2/ ) appears to be dead, wiki.umd.edu is unresponsive. Did the information move?