Thanks for the suggestion, i had seen that post before i created this topic but unfortunately does not help me since i cannot easily convert every mask edit in my system to a text edit.

Guess i was looking for the easy way out, and therefore came up with my own solution to make the mask realize that it was using a numeric input and handle the decimal input which works in the scenarios i mentioned above for me..  Im sure this solution is not perfect, but is working with my mask settings:

        <igtxt:WebMaskEdit ID="mask2" runat="server" InputMask="99.###" PadChar="0" PromptChar="0" EmptyPositionChar="0" DisplayMode="Mask" DataMode="AllText" HorizontalAlign="Right">
            <ClientSideEvents KeyPress="maskDecimalInput_KeyPress" />
        </igtxt:WebMaskEdit>

        // Event which is fired before mask gets character from browser (key).
        function maskDecimalInput_KeyPress(oMask, keyCode, oEvent)
        {
            if (keyCode == 46) //"."
            {               
                var mask = oMask.getInputMask();
                var inputValue = oMask.getValue();
                var decimalPosition = mask.indexOf(".");
                var beginSelection = oMask.getSelection(true);
                var endSelection = oMask.getSelection(false);
                var selectedText = oMask.getSelectedText();

                var emptyChar = oMask.emptyChar; // Should be "0"

                if (selectedText.length == 0 && beginSelection < decimalPosition) //Need to do this to support entering "1." or else the display reverts back to "10."
                {
                    var valueBeforeDecimal = inputValue.substring(0, beginSelection);
                    var emptyMask = mask.replace(/[^\.]/gi, emptyChar);
                    var newValue = emptyMask.substring(0, decimalPosition - beginSelection) + valueBeforeDecimal + emptyMask.substring(decimalPosition);
                    oMask.setValue(newValue);
                }
                else if (selectedText.length > 0)
                {
                    if (selectedText.length == mask.length) //Entire String is highlighted
                    {
                        var newValue = mask.replace(/[^\.]/gi, emptyChar);
                        oMask.setValue(newValue);
                    }
                    else if (selectedText.length != mask.length)  //Partial string is highlighted
                    {
                        var newValue = inputValue.substring(0, beginSelection) + selectedText.replace(/[^\.]/gi, emptyChar) + inputValue.substring(endSelection);
                        oMask.setValue(newValue);
                    }
                }

                oMask.select(decimalPosition + 1); 
            }
        }