Space is allowed in RadMaskedTextInput and disallowed in RadMaskedNumericInput despite of the Mask that is set. If you need only numeric input and disallow the space key, we encourage you to use the RadMaskedNumericInput.
As for the second issue, we logged it in our feedback portal where you can track its status.
Please do not worry for the name of the Thread, the forum name and the explanations are enough. You are not able to edit an already posted name of a thread.
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