In case you missed it: #AzureAD PowerShell v2.0 is now in public preview!

Are there any plans to make make the commands in this module more idiomatic?

Primarily, it's necessary to create an object to execute any of the following commands:

New-AzureADDirectorySetting
New-AzureADObjectSetting
New-AzureADTrustedCertificateAuthority
New-AzureADUser
Remove-AzureADTrustedCertificateAuthority
Select-AzureADGroupIdsContactIsMemberOf
Select-AzureADGroupIdsGroupIsMemberOf
Select-AzureADGroupIdsServicePrincipalIsMemberOf
Select-AzureADGroupIdsUserIsMemberOf
Set-AzureADDirectorySetting
Set-AzureADObjectSetting
Set-AzureADTrustedCertificateAuthority
Set-AzureADUserLicense

Sometimes it's possible to avoid creating the objects explicitly, but the result is very strange. For example, instead of creating a Microsoft.Open.AzureAD.Model.GroupIdsForMembershipCheck, implicitly create it from a hashtable:

Select-AzureADGroupIdsUserIsMemberOf -ObjectId (
    Get-AzureADUser -SearchString someusername |% ObjectID
  ) -GroupIdsForMembershipCheck @{
    GroupIds = Get-AzureADGroup | select -first 20 |% ObjectId
  }

A more idiomatic usage pattern would be:

Select-AzureADGroupIdsUserIsMemberOf -UserPrincipalName someuser@example.com -Groups Group1,Group2,Group3

Horrible code to search for the difficult-to-deal-with commands:

gcm -Module azureadpreview |
  % Parameters|
  % getenumerator |
  % Value |
  group parametertype -NoElement |
  sort name |
  select Name, @{n='Type'; e={[type]($_.Name -replace '.*\[(.+)\]', '$1' -replace '\[\]' -split ',' | gu)}} |
  select *, @{n='IsEnum'; e={$_.Type.IsEnum}} |
  sort IsEnum,Type |
  select *, @{n='ConstructableFrom'; e={$t = $_.Type; [hashtable], [int], [string], [datetime], [boolean], [enum], [object] |?{$t.GetConstructor(@($_))} }} |
  select *, @{n='Constructors'; e={(("[$($_.Type)]::new"|iex).OverloadDefinitions)-notmatch'\(\)'-replace '.*\(','('}} |
  ft -auto

# use judgement to determine the following difficult-to-deal-with types:
  
$DifficultTypes  =
  'Microsoft.Open.AzureAD.Model.AddIn',
  'Microsoft.Open.AzureAD.Model.AlternativeSecurityId',
  'Microsoft.Open.AzureAD.Model.AppRole',
  'Microsoft.Open.AzureAD.Model.AssignedLicenses',
  'Microsoft.Open.AzureAD.Model.CertificateAuthorityInformation',
  'Microsoft.Open.AzureAD.Model.DomainFederationSettings',
  'Microsoft.Open.AzureAD.Model.GroupIdsForMembershipCheck',
  'Microsoft.Open.AzureAD.Model.InformationalUrl',
  'Microsoft.Open.AzureAD.Model.KeyCredential',
  'Microsoft.Open.AzureAD.Model.OAuth2Permission',
  'Microsoft.Open.AzureAD.Model.PasswordCredential',
  'Microsoft.Open.AzureAD.Model.PasswordProfile',
  'Microsoft.Open.AzureAD.Model.PrivacyProfile',
  'Microsoft.Open.AzureAD.Model.RequiredResourceAccess',
  'Microsoft.Open.AzureAD.Model.RoleMemberInfo',
  'Microsoft.Open.AzureAD.Model.SignInName',
  'Microsoft.Open.MSGraph.Model.DirectorySetting',
  'Microsoft.Open.MSGraph.Model.InvitedUserMessageInfo',
  'Microsoft.Open.MSGraph.Model.KeyCredential'

gcm -Module azureadpreview |
  ?{!($_.ParameterSets |
  ?{ !($_.Parameters |?{ $_.ParameterType -in $DifficultTypes -and $_.IsMandatory })  })} |
  select Name, @{n='Parameters'; e={
    $_.ParameterSets.Parameters |?{ $_.ParameterType -in $DifficultTypes -and $_.IsMandatory} | % Name | gu}
  }