You could use CSS in the NavigationTemplates

ASPX Markup

<StartNavigationTemplate>
        <div class="WizardButtonsLeft"><asp:Button ID="CancelButton" runat="server" CausesValidation="False" CommandName="Cancel" Text="Cancel" OnClientClick="javascript:return confirm('Are you sure you want to cancel?');" /></div>
        <div class="WizardButtonsRight"><asp:Button ID="StartNextButton" runat="server" CommandName="MoveNext" Text="Next"/></div>
        </StartNavigationTemplate>
        <StepNavigationTemplate>
            <div class="WizardButtonsLeft"><asp:Button ID="CancelButton" runat="server" CausesValidation="False" CommandName="Cancel" Text="Cancel" OnClientClick="javascript:return confirm('Are you sure you want to cancel?');" /></div>
            <div class="WizardButtonsRight">
            <asp:Button ID="StepPreviousButton" runat="server" CausesValidation="False" CommandName="MovePrevious" Text="Previous" /><asp:Button ID="StepNextButton" runat="server" CommandName="MoveNext" Text="Next"/>
   </div>
        </StepNavigationTemplate>
        <FinishNavigationTemplate>
        <div class="WizardButtonsLeft"><asp:Button ID="FinishPreviousButton" runat="server" CausesValidation="False" CommandName="MovePrevious" Text="Previous" /></div>
        <div class="WizardButtonsRight"><asp:Button ID="FinishButton" runat="server" CommandName="MoveComplete" Text="Submit Announcement" OnClientClick="javascript:return confirm('Are you sure you are finished?');" />
  </div>
        </FinishNavigationTemplate>

CSS:

.WizardButtonsLeft
{
	clear: both;
	float: left;
}

.WizardButtonsRight
{
	float: right;
	display: inline;
	width: 250px; 
}

You might have to play with the width of the WizardButtonsRight to get things to look right. 

In Edit Columns you can add the controls you want and move them around in whatever order you wish.  You can also convert them to Templates for further configuration options. 

Hope this helps.