Decimal column filtering and column name filter problems

krychaj5

Hi!
I have two troubles with my datatable, here is example:
http://live.datatables.net/bododudu/4/

First:
look at the "rate" column - I've added column search for X or greater value but i need to search for decimals not only first number in cell.
Now when I'm putting "1.4" in column search textbox there is no filtering and datatables shows all rows (cause values = 1 or greater), but I need to search for decimals,
For example: I'm putting "1.4" in column search textbox and It's gonna show me only rows with 1.72 and 2.19.

Second:
look at the "Godzina+" column - the data column filtering isn't working here cause of special character "+" in th name, Is there any way to fix that?

Thanks for your answers/helps.