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Remember that RMS measurements assume at least 1 cycle or in your case 100 ms or 10 Hz. So the Ripple Current/rms vs Temp rise is always valid for any duty cycle. This means in theory you can raise the current significantly since the spike is a very low duty cycle. In practice, the device will have some nonlinear fuse limit.
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how much higher can i go in current ripple RMS
None, of course, at least if you want to rely on anything else the datasheet says.
The heating is a function of the RMS current. No, you don't get to cheat physics. Calculate the RMS of the pulse waveform, and make sure that doesn't exceed what the capacitor can handle.
Note also that there may be other limits, like short term pulse current, instantaneous voltage, and possibly maximum allowed heating over a short time window. The RMS of your pulse may be within spec, but it may violate one or more other such parameters.
As always, you have to read the datasheet carefully and make sure you take all the limits into account.
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