keytool -help does not list all options.
keytool -help lists below options
==
>keytool -help
Key and Certificate Management Tool

Commands:

 -certreq Generates a certificate request
 -changealias Changes an entry's alias
 -delete Deletes an entry
 -exportcert Exports certificate
 -genkeypair Generates a key pair
 -genseckey Generates a secret key
 -gencert Generates certificate from a certificate request
 -importcert Imports a certificate or a certificate chain
 -importpass Imports a password
 -importkeystore Imports one or all entries from another keystore
 -keypasswd Changes the key password of an entry
 -list Lists entries in a keystore
 -printcert Prints the content of a certificate
 -printcertreq Prints the content of a certificate request
 -printcrl Prints the content of a CRL file
 -storepasswd Changes the store password of a keystore

Use "keytool -command_name -help" for usage of command_name.
Use the -conf <url> option to specify a pre-configured options file.
==

Missing options
1) -keystore keystore can be directly used with keytool, keytool -help doesn't mention about that
example - keytool -keystore $KS -genkey -dname CN=fmatte -storepass $PASSWORD

2) -import can be directly used to import certificate
example keytool -import -v -trustcacerts -alias keyAlias -file server.cer -keystore cacerts.jks

3) -export can be directly used to export certificate to local file
example keytool -export -alias keyAlias-storepass changeit -file server.cer -keystore keystore.jks

4) -selfcert can be directly used for self signing certs

5) -genkey can be directly used for generating key