Hi,
Thanks for using our plugins I can help answer your questions.
We do not have a feature to validate that field as a number, but I could see doing it with some custom javascript to check and put up an error after someone updates the field. I can help answer questions about it, but it is beyond the support I can provide to provide that coding.
A quick search found this coding that might help out:
http://stackoverflow.com/questions/2405880/jquery-validate-that-text-field-is-numeric
We also do not have a price range, again that could be customized in.
If you would like to request that feature please head to our UserVoice Page and add your own or upvote that feature as they will increase the chances of it being added to a future version.
http://tribe.uservoice.com/forums/195723-feature-ideas
Let me know if you have any follow up questions.
Thanks