Nice one, very useful. You could add 1's complement and 2's complement of the result. Also, there are sooo many CRC algos, maybe a custom CRC would be useful, like Hexwokshop has?. You could launch a new dialog asking for :
Polynomial : 0xaaaaaaaa
Initial Value : 0xbbbbbbbb
XOR output : 0xcccccccc
Reflect input : Y/N
Reflect output : Y/N
which covers just about every 32bit CRC possible.
RIPEMD256 and 320 could be useful, as could simple Checksum. Most useful of all IMO would be a facility to treat the input as binary data rather than an ASCII string. Choice of binary, decimal or hex with sanity check would add polish
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