I started with a 61 key MIDI keyboard without any prior knowledge of theory, fingering etc. and upgraded to Roland FP-30 earlier this year. I believed that I wouldn't require a pitch bend/mod wheel as a beginner, but I started making rapid progress and now miss the option to manipulate sounds in real time.
People who faced similar dilemma were recommended to buy a cheap MIDI keyboard and use its pitch/mod wheel along side their DP-s. That sounds good, but why stop there? Having say a Korg Microkey 25 in front of me means easy access and more opportunity to jam out playing a "one-handed" synth lead. A small micro keyboard is accessible, cheap (no worry about abusing it!) while my DP is not as easily accessible, it's expensive, it's heavy and I treat it like my baby. Common sense is that the more you can practice the better, right?
However, my greatest fear is undoing everything I've learned (muscle memory-wise) if I start spending more time with a small controller with microkeys that require different hand and finger placement. For example: I went a month without playing my DP and then resumed playing, and although I had a slight moment of confusion compared to e.g. if I just played it a day prior, but things worked out fine. Now if I go a month without playing the DP, BUT spend each day playing on microkeys and possibly altering muscle memory......then what? Is my fear valid? Should I avoid playing smaller keys until I'm intermediate level?
It might sound like I'm trying to make a mountain out of a molehill, but I wouldn't risk losing the muscle memory that you work so hard for.