However, I would not use CW mode at all for these, I would use USB for this specific signal.
So why did I say this? In the past some radios did have CW/RTTY specific modes, often using the same switch position on the radio.
CW mode typically selects a narrower filter, CW being a narrow mode of operation. Such a narrow filter might very well clip out portions of the digital / image / data mode you are trying to receive. This is less an issue today with DSP radios and adjustable filters, but when radios used hardware filters (or modern radios with hardware filters) this was a potential problem.
Another issue is that CW mode introduces a frequency bias.
If a CW signal is on the frequency of 7500.000 kHz and you tune to it in USB or LSB, on 7500.000 kHz, then you will hear nothing (almost nothing), until you tune off frequency slightly. This is normal because in these modes the CW signal would be at "zero beat" when tuned to 7500.000 kHz, and so you hear no audio tones. To hear the tones you tune below the frequency in USB mode and tune above the frequency in LSB. The audio tones heard will be equal to the tuning offset.
So CW mode on a receiver intentionally introduces a frequency offset, often around 700 Hz. With such an offset when a signal is on 7500.000 kHz and you tune to 7500.000 kHz in receiver CW mode you hear the dots and dashes as 700 Hz tones (many newer receivers have adjustable CW offsets, so you can set this tone frequency to whatever you are comfortable with).
The problem is that using CW mode on the receiver this offset also is applied to any data signal you have. So now the audio will be the signal offset plus the CW offset.
Assuming your CW offset is 700 Hz if you tuned to the RTTY on 4905 kHz using CW-U and tuned to 4905.000 kHz, and you widened up the filter wide enough to get both Mark and Space the tones will be at 1125 Hz (700 Hz CW offset + 425 Hz from center) and 275 Hz (700 Hz CW offset - 425 Hz from center). Using CW-L mode will result in the same audio tones, but invert the relationship of the Space and Mark.
But STANAG-4481 FSK has a spec of space and mark at 1575 and 2425 Hz, so CW-U or CW-L clearly results in different values.
Better to just use USB (or LSB, as required) with such signals, for pretty much anything except Morse.
T!