The following cameras do not support shooting in bulb mode with DSLR Camera Remote. Unfortunately there is no way for us to add this functionality, as it is a limitation of the Canon EOS SDK which our product is build on top of.

1D Mark II
1Ds Mark II
1D Mark IIn
20D
30D
5D
Rebel XT/350D/Kiss Digital N
Rebel XTi/400D/Kiss Digital X