Need -bc, -ec, -bq, and -eq options on shell scan command

Given the nature of the data we handle, we commonly need to be able to scan via the accumulo shell a row starting at a CF value or starting at a CQ value to be able to efficiently find some data. I would like the following options added to the shell scan command:

-bc,--begin-column [:]
-ec,--end-column [:]
-bq,--begin-column-qualifier
-eq,--end-column-qualifier

It is reasonable to prevent the use -bq and -eq if already using -bc or -ec and it is reasonable to prevent the use of any of these if -b or -e is being used. However those could be intermixed by creating multiple ranges when performing the scan but that is optional for our use case.