The structure and properties of ionic liquids are subjects of current interest. See, e.g.., Angew. Chem. Int. Ed. 2013, 57, 4623,-4627; Ibid.,2009, 48, 3184-3186.
As far as I know, there is no quantitative information on their effects as "polar", hydrogen bond donors or acceptor solvents. This would allow useful comparisons with more usual solvents, perhaps using solvatochromic parameters. See, e.g. Prog. Phys. Org. Chem. 1981,13, 485-630. This would tie-up with recent important experimental work such as J. Chem. Ing. Data 2012,57, 918-927.
Ionic liquids are used to stabilize native proteins (phys. Chem. Chem. Phys. 2012,14,415). Room temperature ionic liquids are also promising for protein crystallization. ILs can also be used in drug delivery since it increases solubility of soluble drugs (int. J. Pharmac., 441, 620, 2013).
This is a very nice question. I agree that there is not much published regarding the hydrogen bond donating (HBD) and accepting (HBA) abilities of ionic liquids. A very interesting recent paper regarding HBD and HBA abilities based on 1H-NMR measurements is the following: ChemPhysChem 2012, 13 (7)1910–1916. "Determination of Hydrogen-Bond-Accepting and -Donating Abilities of Ionic Liquids with Halogeno Complex Anions by Means of 1H NMR Spectroscopy"
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